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[02:06:36] <namll> is there any special configuration needed to send attachments?
[02:07:12] <rob0> No. Email attachments are just part of a message body.
[02:08:58] <namll> ok, so its probably my client then. I can send/recieve emails, recieve attachments. I just cannot send the attachments, when I send the client says it cannot connect to the client. Does the attachment code have to be in a specific part of the email body?
[02:09:28] <namll> cannot connect to the server*
[02:10:49] <namll> yeah it seems the attachment code has to go in the header portion.
[02:11:24] <namll> nvm...
[02:12:16] <thumbs> namll: your question would be better suited in ##email, perhaps
[02:12:35] <rob0> are you writing an email client?
[02:13:11] <thumbs> if so, yikes.
[02:13:33] <namll> i am using mu4e text based email client. For personal project
[02:14:08] <namll> was just curious of it had to do with the postfix side since everything else worked fine. Just dignosing the issue.
[02:14:20] <rob0> Not familiar with it, but yeah, ##email sounds like the better place to go
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[11:19:54] <tuxick> not as good as ##hell
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[14:56:01] <rob0> tuxick, ##hell is real, repent today!
[15:02:24] <Alver> Penitenziagite!
[15:07:37] <tuxick> rob0: i do that every morning
[15:23:04] <buki> rob0: only if not defined as integer!
[15:24:08] <rob0> buki++
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[15:51:41] <lalilulelo> in Google Cloud's documentation on setting up Sendgrid (here: https://cloud.google.com/compute/docs/tutorials/sending-mail/using-sendgrid), there's a part with a setup for Postfix. It says at some point to uncomment a few lines, but they aren't present in my main.cf file. It's okay if I just add them uncommented, right?
[15:53:39] <lunaphyte> "uncomment a few lines" is just another way of saying "add a few lines"
[15:56:29] <rob0> an ignorant way :) Basically it says that the writer might not understand that different distributors send out different main.cf files.
[15:57:10] <lunaphyte> yup
[15:57:14] <rob0> (but that doesn't apply if the writer specified a particular distro and version.)
[15:57:31] <lunaphyte> and don't get me started on this "port 2525" brain dead nonsense
[15:57:37] <rob0> yikes
[15:58:07] <lunaphyte> that kind of crap is SO incredibly irresponsible
[15:58:09] <rob0> I didn't bother to review the URL. I rarely do. They're all bad.
[16:00:43] <lunaphyte> ignore the crappy advice in that "tutorial"
[16:01:15] <lunaphyte> instead, just use the normal, well documented, appropriate ports for email submission. that means either 587, or 465
[16:01:22] <lunaphyte> it's what they're for
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[16:06:24] <lalilulelo> I see, thanks for the answers
[16:06:36] <lalilulelo> btw, what exactly is irresponsible there?
[16:06:50] <lalilulelo> I'm new to this whole mail configuration thing, it's pretty overwhelming lol
[16:07:43] <Kelsar> lalilulelo: if you don't plan to invest an ample amount of time to get this running and keep that running later, you shouldn't run your own mailservice imho
[16:08:06] <lalilulelo> I'm mostly just trying to set it up with Sendgrid
[16:08:16] <lalilulelo> was discouraged from trying to run my own thing yesterday
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[16:24:37] <rob0> I'm sure Sendgrid offers standard submission/submissions service.
[16:26:12] <lalilulelo> oh lol, I was reading it wrong, it said to "comment out", not uncomment
[16:26:43] <lunaphyte> the same premise applies
[16:26:55] <lunaphyte> making assumptions about what is in a config? blech
[16:28:20] <lalilulelo> lol I see
[16:30:00] <rob0> Even if the writer DID specify a distro and version, a better writer would have written generic instructions.
[16:37:15] <lalilulelo> makes sense
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[18:01:12] <lalilulelo> In /etc/postfix/main.cf, in the line "relayhost = [smtp.sendgrid.net]:587", does this 587 port number refer to the port that will be used in sendgrid when connecting to it, or is it my own machine's outbound port?
[18:03:24] <rob0> um, IIUC the question, both? You make a connection to smtp.sendgrid.net's port 587. If you mean your system's source port, of course not, that is randomly selected by the kernel.
[18:04:09] <rob0> Postfix doesn't even have any smtp(8) source port selection setting.
[18:09:06] <lalilulelo> aah, I see
[18:12:08] <lalilulelo> google cloud's documentation tells me to use 2525 on that, it tells me that it(self) blocks port 587
[18:12:34] <lalilulelo> but I thought it just blocked the system's outbound port
[18:14:31] <rob0> Google blocks outbound 587? Seriously?
[18:15:00] <rob0> are you on one of these gcloud instances now?
[18:15:11] <rob0> if so, test it with telnet
[18:15:36] <rob0> wow, that would be a stupid port to block
[18:16:08] <lalilulelo> https://cloud.google.com/compute/docs/tutorials/sending-mail/using-sendgrid => search "587", there's a blue "Note" saying it blocks both 587 and 25
[18:16:19] <lalilulelo> I am
[18:16:34] <lalilulelo> how do I test with telnet?
[18:16:48] <rob0> yes
[18:16:57] <rob0> test with telnet
[18:18:34] <lalilulelo> how do I do that? and... what am I testing by testing with telnet? (I don't quite know what it is so go easy on my noobness lol)
[18:18:59] <rob0> telnet smtp.sendgrid.net 587
[18:19:05] <lalilulelo> aah
[18:19:20] <rob0> 220 SG ESMTP service ready at ismtpd0001p1sjc2.sendgrid.net
[18:19:57] <lalilulelo> got that same message, it's connected
[18:20:12] <rob0> nc is a more sophisticated tool for that, but I always use telnet anyway
[18:20:15] <lalilulelo> so google doesn't actually block it, huh?
[18:20:32] <rob0> and the tutorial is wrong, imagine that! :)
[18:20:48] <lalilulelo> what does telnet do? make a TCP connection in a particular port at the remote host?
[18:21:12] <lalilulelo> damn, that sucks, I'm at a loss for over a day trying to set up an email for this website
[18:21:22] <lalilulelo> I just want to send, like, confirmation emails and stuff lol
[18:21:51] <rob0> these are basic network troubleshooting tools that you should learn. I'd recommend nc for a beginner, but I'm old fashioned.
[18:22:20] <lalilulelo> hmm, nc, huh
[18:22:58] <lalilulelo> I'll look into it, thanks for the advice regarding it
[18:24:58] <lunaphyte> i've been trying to retrain myself to use nc instead of telnet for a little while now
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[18:26:47] <rob0> for smtp it doesn't really matter, since smtp expects DOS-style line ends
[18:27:38] <rob0> and of course the case of TLS, you need to use s_client
[18:28:44] <rob0> I only use s_client when I have to.
[18:29:22] <lunaphyte> gnutls-cli is an alternative to s_client
[18:29:48] <rob0> yeah, I have seen that but never tried it
[18:30:45] <lunaphyte> it's the same thing ultimately. they're both fine
[18:31:15] <lunaphyte> that said gnutls-cli does not suffer from the capital r pitfall like s_client does
[18:31:51] <lunaphyte> which imho is dumb, but also, stop using capital letters when there's zero benefit to it :)
[18:35:19] <rob0> LOL
[18:35:27] <rob0> oops, sorry, lol ;)
[18:35:40] <lunaphyte> BWAHAHAHAHAAAA
[18:39:03] <petn-randall> lunaphyte: What is the capital r pitfall?
[18:39:25] <rob0> "[R]enegotiate TLS"
[18:39:39] <rob0> it's a command that s_client listens for
[18:40:22] <rob0> so if you type "RCPT TO:<something>" you get TLS renegotiated
[18:40:35] <petn-randall> So anywhere in the command you give a capital R ... yep, that's what I thought.
[18:40:54] <rob0> not sure if it's anywhere or just the first letter
[18:40:57] <petn-randall> Which might fail depending on the TLs implementation.
[18:41:53] <rob0> To send mail through s_client you have to do "rCPT TO:<something>" or all lowercase, as lunaphyte prefers :)
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[18:52:01] <lalilulelo> so my mail to gmail is getting bounced, I read somewhere it could be because reverse DNS lookup is invalid... also, in the logs, it seems like my messages are coming "From" my <my_user>@<some weird-looking internal google cloud network domain> instead of <my_user> at <my_domain> dot .. how would I go about making sure that mail is sent through Sendgrid from my Google Cloud instance while correctly identified by my domain?
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[18:54:23] <rob0> That's most likely not a Postfix issue; your mail client (whatever creates and sends the mail) would use a real sender address.
[18:54:31] <rob0> That said, see also:
[18:54:34] <rob0> !basic
[18:54:35] <knoba> rob0: http://www.postfix.org/BASIC_CONFIGURATION_README.html : a good starting place for Postfix beginners, many common questions are answered here.
[18:54:40] <rob0> !myorigin
[18:54:40] <knoba> rob0: The default domain name that locally-posted mail (with no @domain on the sender address) gets for sender domain, and that arriving mail for <localpart-only> is delivered to. See also !append_at_myorigin
[18:58:44] <lalilulelo> hmmm, I'll go read that readme, thanks
[18:59:58] <effprime> hi all, weird issue that could by XY, but just curious if there's a solution here: https://pastebin.com/efBf6ZdK thanks for reading
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[19:05:48] <rob0> anyone else getting those pastebin.com errors a lot lately?
[19:10:31] <petn-randall> Looks like this is being crossposted everywhere, so I'm not touching this.
[19:11:12] <rob0> ah
[19:12:12] <petn-randall> The user would otherwise type the problem, and not spam with a pastebin link. :)
[19:23:34] <effprime> I am happy to paste the issue, it was never crossposted
[19:23:49] <effprime> I thought it was considered rude to spam a long wall of text in IRC
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[19:24:05] <rob0> effprime, !basic (scroll up a few lines) might help, and verbose logs are definitely NOT going to help.
[19:24:50] <effprime> !basic
[19:24:50] <knoba> effprime: http://www.postfix.org/BASIC_CONFIGURATION_README.html : a good starting place for Postfix beginners, many common questions are answered here.
[19:24:53] <effprime> ah I see
[19:25:11] <effprime> why wouldnt verbose help?
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[19:26:13] <rob0> if you don't grok what's in regular logging, verbose logs will only confuse you more.
[19:26:37] <effprime> well the regular logging only told me that a connection happened and then that it disconnected
[19:26:42] <effprime> hence why I switched to verbose
[19:27:14] <rob0> a client does not tell (there is no protocol means for it to tell) a server why it disconnects
[19:28:28] <rob0> If it sees some reason why it can't continue, it disconnects. Client logs might tell you what was wrong, if there are such logs.
[19:28:46] <effprime> connection unexpectedly closed: timed out
[19:29:05] <effprime> it's a python module making the connection so checking its verbosity was my next guess
[19:29:22] <rob0> the python module is where the problem lies, then
[19:30:07] <effprime> so the verbose logs from postfix mean nothing?
[19:31:17] <effprime> and I'm not sure I understand, if postfix doesn't like the mail being sent, then it can't close the connection on its end?
[19:32:07] <rob0> did Postfix non-verbose logs say it closed the connection, or "connection unexpectedly closed: timed out"?
[19:33:09] <rob0> and no, smtpd is not capable of processing a mail being sent nor of deciding to cut off a client in DATA
[19:33:27] <rob0> Maybe if size limits were exceeded
[19:34:09] <rob0> Anyway, if Postfix closed the connection, non-verbose logs would say so, and why.
[19:34:44] <effprime> the client is saying there was a timeout, non-verbose postfix simply says "connect from unknown[ip]" then shortly after "lost connection after CONNECT from..."
[19:35:02] <effprime> so fair enough, I guess the connection is being lost
[19:35:15] <rob0> fact
[19:35:47] <effprime> I just don't understand why docker would be the deciding factor here
[19:35:57] <effprime> since the client config doesn't change, and it works fine without docker
[19:36:07] <rob0> smtpd CAN cut off a connection if rules are violated, such as too many invalid SMTP commands given
[19:36:19] <rob0> (this would be logged)
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[19:51:33] <d-fens_> hi, i have a working virtual users setup, now some mailboxes got migrated to office365 *sigh* and this is also the new mx entry. office mailboxes do work and non office users get forwarded to the postfix server. sending from postfix to office mailboxes(same domain) do fail: its delivered local and fail (nonexistend virtual user) although i set up transport map but its ignore
[19:52:36] <d-fens_> anyone has experience with virtual users and split domains?
[19:54:29] <d-fens_> or how can i priorize transport_map before user lookup
[19:55:32] <rob0> "Virtual" isn't much of a factor. The main thing is that BOTH o365 and Postfix need to know ALL valid addresses and WHERE each one should go.
[19:55:45] <rob0> !standard
[19:55:45] <knoba> rob0: Your question is probably answered in http://www.postfix.org/STANDARD_CONFIGURATION_README.html
[19:56:10] <rob0> ^^ has a split domain example, http://www.postfix.org/STANDARD_CONFIGURATION_README.html#some_local IIRC
[19:57:11] <d-fens_> nope, office has a mode of forwarding unknown users to the postfix server, that does work
[19:57:32] <effprime> rob0: just wanted to say thanks, I changed our library timeout to be bigger and it seems to work now, at least better than it did
[19:57:33] <d-fens_> i'll check that thx
[19:57:46] <effprime> I had no idea this was client related
[19:58:35] <rob0> d-fens_, so what happens when a Postfix user tried to send mail to a o365 address, or vice versa?
[19:59:20] <d-fens_> office -> postfix: works, postfix->office :550 unkown user
[19:59:41] <rob0> also, how do you deal with backscatter, such as when a spammer does a dictionary attack on @your-domain?
[20:00:17] <d-fens_> sqlgrey etc, that does all work
[20:00:37] <rob0> sqlgrey? And you're not even the MX?
[20:00:44] <rob0> that's silly
[20:01:12] <d-fens_> its handles more domains
[20:01:15] <rob0> not to mention that greylisting has been out of date since 10+ years
[20:01:38] <rob0> okay, but I was specifically asking about the o365 domain and backscatter
[20:01:42] <rob0> 17:59 < rob0> also, how do you deal with backscatter, such as when a spammer does a dictionary attack on @your-domain?
[20:01:52] <d-fens_> that would be anothjer topic and you may be right but i try to solve another problem
[20:02:37] <d-fens_> postfix gives a ndr as before without the office scenario
[20:03:38] <d-fens_> its no difference when office is in between the spam or not
[20:05:30] <rob0> that's backscatter, you are likely to be blocked as a source of abuse.
[20:07:03] <d-fens_> actually the system works with spamprotection for about 12 years now...
[20:07:52] <rob0> I mean YOU are the source of abuse, who cares about your protection?
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[20:23:54] <d-fens_> http://its-netzwerk.com/bscatter/ tested ok so i don't know how you come to such a statement
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   September 18, 2019  
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