rejected messages

[Vinnie]

I can't send more than 4 messages at a time without getting a message back
saying that they could not be delivered because they exceeded the number of
emails allowed or something like that. I believe I get the message from my
Norton product. I checked with my server and they said they have no such
rule. How would you correct this problem? And I do try to remember to only
send four messages at a time, but sometimes I forget and then I don't know
which ones went through and whick ones didn't, very frustrating! Thanks

 

[VanguardLH]

I can't send more than 4 messages at a time without getting a message back
saying that they could not be delivered because they exceeded the number of
emails allowed or something like that. I believe I get the message from my
Norton product. I checked with my server and they said they have no such
rule. How would you correct this problem? And I do try to remember to only
send four messages at a time, but sometimes I forget and then I don't know
which ones went through and whick ones didn't, very frustrating! Thanks

So does "4 messages at a time" mean you are sending out 4 *separate*
e-mails (to different recipients)? Or does it really mean you are
actually sending out 1 message to 4 recipients?

SMTP works by sending 1 copy of your message to the mail server along
with a list of recipients. Your e-mail client compiles an aggregate
list of recipients from those that you specified in the To, Cc, and Bcc
fields in the UI of that e-mail client. It then sends a separate
RCPT-TO command to the mail server for each recipient in that aggregate
list. After that, it sends just 1 DATA command to send your message to
the mail server. So, for 4 recipients, your e-mail client sends 4 RCPT-
TO commands followed by 1 DATA command.

So have you tried disabling the e-mail scanning in your Norton product
(which doesn't identify that product since Norton is a division of
Symantec, not a product name)? Most likely its e-mail scanning is
interferring with the mail transfer. Some anti-virus programs have worm
detection (where the worm attempts to use the e-mail client to send
multiple spam e-mails). That protection limits how many e-mails you can
send per minute or 5-minute interval, the max number of recipients, and
so on. You could go check the unidentified Norton product to see if it
has this worm protection and what are the abuse maximums that it
detects, or just disable its e-mail scanning and test if the problem
goes away.