Sending domain does not exist but it actually does?
Hi,
Lately I've been getting some bounced mail from people at the provider/server plus.com. I've redacted addresses, but this is the error message:
<<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces@xxxxxxx.com> does not exist 554 5.0.0 Service unavailable
Obviously, the sending domain *does* exist, so I assume it's their problem. Is there anything at all I can do about this? Not all mail to these users bounces.
Thanks,
Jayson
Hi Jayson
Who was the domain "complaining" about this? You did not mention.
We recently had the problem that German provider "1&1 Internet" (who also operates one of the biggest freemail services, GMX, and some other mail domains) would not accept mails from our domain (and also not send to it), throwing an error message about some missing MX record. However, all other domains (or addresses) could be reached without any problems, and they could also send mails to us.
Please check on the site of GMX <https://postmaster.gmx.com/en/error-messages> what the requirements are for them to accept mail messages. Then you can check your DNS entries using <https://intodns.com/> whether all necessary entries are there.
Christian
Jayson Smith <mailto:jaybird@bluegrasspals.com> 22. M�rz 2018 um 15:10 Hi,
Lately I've been getting some bounced mail from people at the provider/server plus.com. I've redacted addresses, but this is the error message:
<<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces@xxxxxxx.com> does not exist 554 5.0.0 Service unavailable
Obviously, the sending domain *does* exist, so I assume it's their problem. Is there anything at all I can do about this? Not all mail to these users bounces.
Thanks,
Jayson
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On 03/22/2018 07:10 AM, Jayson Smith wrote:
<<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces@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@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
FYI the host in question is bluegrasspals.com. It does have an A record, and its ip has proper reverse nslookup back to the domain. My host supports IPV6 but I'm not using it for mail.
Jayson
On 3/22/2018 1:41 PM, Mark Sapiro wrote:
On 03/22/2018 07:10 AM, Jayson Smith wrote:
<<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces@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.
On 03/22/2018 01:14 PM, Jayson Smith wrote:
... My host supports IPV6 but I'm not using it for mail.
As in you have "inet_protocols = ipv4" in your postfix config (or the equivalent for your MTA)? Otherwise it's not quite up to you.
-- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
On 03/22/2018 11:14 AM, Jayson Smith wrote:
FYI the host in question is bluegrasspals.com. It does have an A record, and its ip has proper reverse nslookup back to the domain. My host supports IPV6 but I'm not using it for mail.
That should be OK assuming as Dimitri Maziuk says you have "inet_protocols = ipv4" in your postfix config (or the equivalent for your MTA).
However, I note the domain doesn't have an MX. That should be OK as it does have an A, but since plus.com is apparently misbehaving, we have no clue as to what they are looking at, and adding an MX may help.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
On 03/22/2018 01:48 PM, Mark Sapiro wrote:
That should be OK assuming as Dimitri Maziuk says you have "inet_protocols = ipv4" in your postfix config (or the equivalent for your MTA).
On 2nd thought, if they are the ones bouncing, *they* may be running AAAA query instead of the A one. Check if that resolves, in addition to MX.
-- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
Hi,
I checked my domain, and it turns out somehow my MX record got blown away. Also a while back I canceled No-Ip Plus managed DNS, thinking it was only used for dynamic DNS, but in the process I threw away my SPF record which I've now recreated after re-enabling Plus. Also lost my DKIM record which I've recreated. We'll see if that resolves anything.
Thanks for your pointers.
Jayson
On 3/22/2018 2:48 PM, Mark Sapiro wrote:
On 03/22/2018 11:14 AM, Jayson Smith wrote:
FYI the host in question is bluegrasspals.com. It does have an A record, and its ip has proper reverse nslookup back to the domain. My host supports IPV6 but I'm not using it for mail.
That should be OK assuming as Dimitri Maziuk says you have "inet_protocols = ipv4" in your postfix config (or the equivalent for your MTA).
However, I note the domain doesn't have an MX. That should be OK as it does have an A, but since plus.com is apparently misbehaving, we have no clue as to what they are looking at, and adding an MX may help.
participants (4)
-
Christian F Buser -
Dimitri Maziuk -
Jayson Smith -
Mark Sapiro