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4247
2008 Oct 14
3
Sendmail and pmtu discovery
...t#Mordac).
My mail logs are showing that customers who specifically disallow ICMP
traffic have many "Connection Reset" entries in our logs:
Oct 14 08:00:50 mailsrv sendmail[2024]: m9ED0Yf5002021:
to=<customername at customer.org>, delay=00:00:16, xdelay=00:00:16,
mailer=esmtp, pri=42476, relay=mail.customer.org. [XX.XX.XX.XX],
dsn=4.0.0, stat=Deferred: Connection reset by mail.customer.org.
I have disabled pmtu discovery on our routers as well as on all our
outbound mail servers. Is there anything else I can do on our side to
help the situation?