Moving an existing Mail Relay from one VM to another.
v.andrews at noc.ac.uk
Tue Mar 23 08:19:13 UTC 2021
Thanks for your comments.
I have just successfully moved the system over to a new VM. It turned out that the issue was to do with Network Manager and how I had moved the ifcg file for the network port.
$ mv ifcfg-eno323232 ifcfg-eno323232.as-X
$ mv as-Y- ifcfg-eno323232 ifcfg-eno323232
Network Manager attempted to load the new ifcfg but found a conflict with the renamed one. Even though it accepted the new IP address (from the retired system) and I could log on, sendmail was having none of it and failed to forward on mail that MailScanner had passed.
This error only produced a warning message in the messages file.
On 17/03/2021, 17:51, "MailScanner on behalf of Mark Sapiro" <mailscanner-bounces+v.andrews=noc.ac.uk at lists.mailscanner.info on behalf of mark at msapiro.net> wrote:
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On 3/17/21 1:48 AM, Andrews, Vincent wrote:
> We moved the IP Address from the existing VM to the new and changed
> /etc/hostname and rebooted.
> We then noticed that mail was being delayed by two key 365 domains. We
> left it like that for about 40 minutes and then reverted to the existing
> server. After which mail was processed correctly. The messages in
> /var/spool/mqueue were moved to the existing system and within 10
> minutes everything was cleared.
> Has anyone had a similar experience?
There are always issues with new mail servers whose IP address has not
yet developed a reputation, but IIUC, from the remote's point of view,
the IP hasn't changed.
> Could it be that the new VM – having a different MAC address – was being
> flagged as an illegal mail relay?
And how would the remote SMTPD server determine the MAC of the sending
server? I don't think that's possible. I don't know why there would be
an issue if the IP didn't change. What is the content of the 4xx
responses from the remote?
Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan
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