Author Topic: No Mails from  (Read 346 times)

Offline Warlock666

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No Mails from
« on: January 30, 2019, 07:09:30 AM »
Hi @all,

by accident I found out, that the SMTP Server that sends Mails for is not properly configured.
In the SMTP Dialog it claims to be "httpd3.localdomain" - A hostname that can't apparantly be resolved. Even worse - the reverse record for its IP adress, which is, can't be resolved, too.
Checking the Hostname in the HELO dialog against the reverse DNS record is a pretty basic method to avoid spam.

So I guess I'm not the only one who does not receice any mails from anymore.

Attached you will find an example log

Jan 30 12:53:16 lemmy postfix/smtpd[32502]: warning: hostname does not resolve to address Temporary failure in name resolution
Jan 30 12:53:16 lemmy postfix/smtpd[32502]: connect from unknown[]
Jan 30 12:53:16 lemmy postfix/smtpd[32502]: NOQUEUE: reject: RCPT from unknown[]: 450 4.7.1 <httpd3.localdomain>: Helo command rejected: Host not found; from=<> to=<mymailadress@mydomain.tld> proto=ESMTP helo=<httpd3.localdomain>
Jan 30 12:53:16 lemmy postfix/smtpd[32502]: disconnect from unknown[] ehlo=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=4/6

Could you please forward this to your Mailadmin ?
In case there are any questions left I'd be glad to help you.

Bye !

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Re: No Mails from
« Reply #1 on: January 30, 2019, 07:20:46 AM »
Thank you, I've moved this to a better board.
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Offline Warlock666

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Re: No Mails from
« Reply #2 on: January 30, 2019, 07:23:48 AM »
Thanks you !
"Site Comments, Issues and Concerns" fits much better, indeed. Looks like I oversaw this - Sorry for that !

Offline CoreISP

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Re: No Mails from
« Reply #3 on: January 30, 2019, 07:39:39 PM »
Thanks for your report.
This is a known-issue that comes and goes when we have to switch the delivery method and the mismatching domains and IP’s is a result of the the way the stack functions internally. It’s essentially a failover method that then goes through a layer of network translation and unfortunately sometimes may run in that configuration for an extended period of time.

A permanent fix will be implemented and is on the to-do list.
Fortunately a new server that can relieve the problem has recently arrived in the datacenter, just waiting on some parts. :) I’ll see if I can re-route it without issues in the meantime.
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Offline Warlock666

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Re: No Mails from
« Reply #4 on: January 31, 2019, 01:24:41 PM »
Cool, I'm glad that this issue is already known and that there are already plans to fix this.
Thanks a lot for your feedback  :)