Hello!
We have a strange behavior when PTR records would be checked.
It seems that mailenable didn't get a answer from the dns-server or the answer is corrupted.
The same happend on other messages to, but in this example it could be seen perfectly, that one recipient has failed the PTR check while the second passed.
Activity Log:
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 220 Welcome to mailserver ESMTP Server 41 0
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 EHLO EHLO mail6.sender.com 250-mailserver.at [111.222.333.444], this server offers 7 extensions 222 23
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 STARTTLS STARTTLS 220 Ready to start TLS 24 10
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 EHLO EHLO mail6.sender.com 250-mailserver.at [111.222.333.444], this server offers 7 extensions 181 23
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 MAIL MAIL FROM:<sender@sender.com> SIZE=309924 250 Requested mail action okay, complete d 43 54
03/07/23 10:43:51 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 RCPT RCPT TO:<first@recpt-domain.at> 554 This server requires PTR for unauthenticated connections. 63 33
03/07/23 10:43:54 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 RCPT RCPT TO:<second@recpt-domain.at> 250 Requested mail action okay, completed 43 34
03/07/23 10:43:54 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 DATA DATA 354 Start mail input; end with <CRLF>.<CRLF> 46 6
03/07/23 10:43:54 SMTP-IN 659B519B9E9B492A9B0E321D3931469E.MAI 1416 111.222.333.444 DATE 250 Requested mail action okay, completed 43 313459
Debug Log:
03/07/23 10:43:51 [1416] Successfully started inbound SSL conversation
03/07/23 10:43:51 ME-I0101: [1416] Local Delivery: Address ([SMTP:first@recpt-domain.at]) is local.
03/07/23 10:43:51 ME-E0114: [1416] Recipient Denied: (111.222.333.444) has no PTR. Result 9501.
03/07/23 10:43:51 ME-I0101: [1416] Local Delivery: Address ([SMTP:second@recpt-domain.at]) is local.
03/07/23 10:43:54 ME-I0149: [1416] 659B519B9E9B492A9B0E321D3931469E.MAI was received successfully and delivery thread was initiated
03/07/23 10:43:59 ME-I0070: (recv) socket [1416] was gracefully closed during [QUIT] command by the remote client 111.222.333.444.
03/07/23 10:43:59 ME-I0074: [1416] (Debug) End of conversation
We tried changing the DNS Servers to different servers, but the problem still occour from time to time.
Maybe its a flapping internet connection or firewall related problem, or simple a timeout while querying the dns server.
What could we do to resolve this issue?
Could mailenable ignore PTR somehow checks if the DNS query fails?
This problem has been posted in the forum a few months ago, but there was no solutions included:
https://mailenable.com/forum/viewtopic.php?f=7&t=44292
Thanks and regards,
Andreas
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