Yesterday we had an issue with an old DNS record in our system. We deployed a new faxcore server with the same IP address as the old server. The person doing this did not delete the old DNS entry which the PTR record was pointing to the old server FQDN. I deleted the old DNS record freeing up the PTR record. I then updated the new DNS record to update the PTR record to point to the new FQDN. Immeadiately we saw faxes start going through. More than 12 hours later we have some that still retrying with the same error. Others have sent faxes to the same number with success. Here are two of the entries I'm looking at.
2023-06-07T14:13:25.279Z,172.24.0.185,<ExchangeServer,<FaxCoreIP_Address>,Retrying due to suspicious connection reset.Progressive backoff retry time of: 00:10:00,Simfax,SMTP,DEFER,116848880255142,<email address removed for privacy reasons>,ff714c12-b24a-4454-47de-08db66b08d5c,email address removed for privacy reasons,'[{LED=450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError)};{MSG=};{FQDN=<FaxCoreIP_Address>};{IP=<FaxCoreIP_Address>};{LRT=6/7/2023 2:09:44 PM}]',739847,1,,,ATTN POA / Address change request included,<user_email>,<user_email>,2023-06-07T14:23:25.279Z,Incoming,,,,S:Microsoft.Exchange.Transport.MailRecipient.RequiredTlsAuthLevel=Opportunistic;S:IsSmtpResponseFromExternalServer=False;S:RecipientsAlreadySmtpDeferLogged=true;S:DeliveryPriority=Normal;S:AccountForest=<FQDN_Domain>,Email,21412387-c548-4368-684a-08db67615bce,15.01.2507.023
Good fax:
023-06-07T14:11:33.582Z,,,,V-EXCH16-P,No suitable shadow servers,,SMTP,HAREDIRECTFAIL,116939074568192,<email address removed for privacy reasons>,41f0a756-cadc-4d95-5a21-08db67611939,email address removed for privacy reasons,,12001,1,,,Test,<User_Email>,<User_email>,,Incoming,,,,S:DeliveryPriority=Normal;S:AccountForest=<FQDN_Domain>,Email,9a0d263d-73e1-4636-bd35-08db6761193a,15.01.2507.023
I either need to clear the queue for these users or figure out a way to resolve the Supicious
