Problem with SMTP connection

[chilly2go]

Hi, I'm running my own mailserver with mailcow for multiple years now.

Trying to send mailings with keila through my server proved to be non-functional. I tried all combinations for ports / tls.

what I got was:

postfix/submission/smtpd[99996]: connect from unknown
postfix/submission/smtpd[99996]: SSL_accept error from unknown
postfix/submission/smtpd[99996]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:331:
postfix/submission/smtpd[99996]: lost connection after STARTTLS from unknown

now after enabling TLS 1.0 and 1.1 again I got a connect and nothing more. on the server side. after 10 minutes keila logs:

[warning] Failed sending email to target@testmail for campaign nmc_GQL5WVpk: {:retries_exceeded, {:network_failure, 'my.server.ip', {:error, :closed}}}

This looks to me as having two smtp related problems:

• Outgoing connections use old / insecure encryption protocol version
• SMTP sending seems to have general problems (other connection attempts trigger more logging on the mail server that atleast results in a PREGREET message)

I do hope you can reproduce this.

Docker just tells me that I'm running the image tagged "latest" created "2 weeks ago"

[wmnnd]

Hey there, thanks for reporting this. Have you been able to resolve this problem in the meantime?

[chilly2go]

Nope. In the mean time I tried sendgrid but the log only shows: {"errors" => [%{"field" => nil, "help" => nil, "message" => "The provided authorization grant is invalid, expired, or revoked"}]}

Showing campaign statistics is no help at all as the amount of information shown is exactly 0 No warning or error notification or recipients with delivery problems. Nothing

With the problems I'm running into I have to ask if anyone can currently use keila to deliver mails. And how (if at all possible)

[chilly2go]

I also tried sendgrids smtp relay...

Port 25 without TLS {:retries_exceeded, {:network_failure, '52.57.139.126', {:error, :closed}}}

Port 587 with TLS {:retries_exceeded, {:network_failure, '18.197.194.208', {:error, {:options, :incompatible, [verify: :verify_peer, cacerts: :undefined]}}}}

[wmnnd]

Have you tried Port 587 without setting the "force TLS" setting?

[chilly2go]

With my own mailserver. Yes With sendgrid. No

[chilly2go]

Port 587 without TLS {:retries_exceeded, {:network_failure, '18.197.194.208', {:error, :closed}}}

[enzokabella]

We have the same problem. 12:36:11.388 [warning] Failed sending email to XXX@XXX.de for campaign nmc_neLWGkLw: {:retries_exceeded, {:network_failure, '80.237.132.207', {:error, {:options, :incompatible, [verify: :verify_peer, cacerts: :undefined]}}}}

no emails are going out. We use the keila docker container.

[chilly2go]

Currently keila is unusable for me. sadly I'm moving to a different solution

[wmnnd]

Thank you all for reporting this issue.

I think this issue is caused by recent changes in Erlang/OTP, but I’m still investigating.

[wmnnd]

This issue should be fixed in the 0.12.6 release.