Build identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB;
rv:1.9.1.15) Gecko/20101027 SeaMonkey/2.0.10
Only 1 email account, POP3 mailbox. ADSL broadband normally tests as
5+Kbps download, 380+bps upload. Local exchange upgraded couple of
weeks ago by British Telecom, but my problem pre-dates that by some weeks.
For some time now, I've been experiencing issues with outgoing mail
(SMTP) only. Downloads of new mail and newsgroup headers, and web pages
works as well as it ever does (I hate contention, don't you?) But
randomly when sending mail, the send process can take quite a bit of
time, even fail completely. An immediate re-send without closing the
original composition window almost always works. The number of
recipients doesn't matter, nor does the size of the email (from 1 line
of text to a 5MB Word doc). And then there's time of day, also NOT a
contributing factor.
Aside from disabling/uninstalling my AV software, checking NIC drivers,
etc., I've used network sniffing tool WireShark to look at what's going
on. I think I've found one issue belonging to the ISP: during the send
process, all recipient addresses are sent to the ISP, one at a time.
The server acknowledges the receipt of one name, and then after a delay
sends a code for SM's mail client to send the next one. The
delay/failure I'm seeing appears to be based on how long it takes the
server to finish chewing on what was sent and then ask for the next bit.
I've got packet trace captures for 4 events where everything works as
expected, and 4 traces when it took either very long or failed
altogether. The ISP says it must be something at my end, 'cause no one
else is reporting it, therefor it must be my mail client.
Can anyone confirm the expected mail client/server behavior, or point me
at an authoritative web source for the info? My ISP's level 3 support
is convinced it's me, and my traffic sniffing captures say it's them,
but they don't appear interested in that.
Any help appreciated.
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