[Mailman-Users] Sending domain does not exist but it actually does?

Mark Sapiro mark at msapiro.net
Thu Mar 22 13:41:54 EDT 2018

On 03/22/2018 07:10 AM, Jayson Smith wrote:
> <<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces at xxxxxxx.com>
> does not exist
> 554 5.0.0 Service unavailable

I would check the following in DNS

Does xxxxxxx.com have an A record (not a CNAME)?
Does the IP address in that A record have a PTR (rDNS) back to xxxxxxx.com?
If you support IPv6, check the same things for the AAAA record.

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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