From: Hargis, Mandy (no email)
Date: Tue May 01 2007 - 10:36:04 EDT
>Are you perhaps behind a NAT gateway? This may expire the connection
from its tables too early. Such boxes tend to be optimized for
short-lived http connections which is bad for email.
I'm not behind a NAT gateway.
>Is the remote SMTP server behind a NAT gateway?
The remote SMTP servers include hundreds of servers such as verizon.net,
yahoo, many .edus, gmail, etc.
>In either case, it may help to turn on keep-alives.,
Current Solaris setting:
> ndd -get /dev/tcp tcp_keepalive_interval
7200000
>This is currently not built into Postfix.
I have not installed the Postfix patch that you provided in the separate
message. I'm just wondering how my inbound SMTP servers could have been
running for three + years without this patch or problem. How could it
be necessary all of a sudden?
>Are there large messages that DON'T fail?
Yes many large messages have no problems. Oddly enough this seems to
happen when a message contains a .vcf or .html file attachment.
>How many EMAIL MESSAGES are you sending in parallel?
default_destination_concurrency_limit = 20
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