Problem with sendmail 8.13.7

[Stefan Kuhlemann]

Paul Howarth schrieb:
> Stefan Kuhlemann wrote:
>> Hi  mailinglist
>>
>> I have a strange problem with sendmail 8.13.7. (Fedora Core 5)
>>
>> Sendmail is not able to send out any mail's. But: other smtp-hosts 
>> are able to contact and deliver mails to this sendmail. The acutal 
>> configuration did work until the last update via yum (which included 
>> the sendmail update).
>>
>>
>
> Broken firewall rules perhaps?
>
> Any SELinux errors in the logs?
>
> Paul.
>

Already checked the firewall rulesets before.  Also no SELinux errors.

even more strange - today around 10:00 o'clock the sendmail started to 
work normal until 16:00 o'clock. (with nothing changed since sunday 22:00)

My feelings tell me that the reason might be some strange 'ill-broken' 
firewall network stack or some weird netwok communication issues (like 
the 'fun' with the ECN-flag some years ago)
I'm tomorrow 'on-site'......

Stefan