I am finding subscribers' ISP that use

Symantec_AntiVirus_for_SMTP_Gateways

very annoying esp. with these "delayed" type messages sent back to list-owners:


Your message with Subject: blah-blah-blah

could not be delivered to the following recipients:

[RFC822 address]

Please do not resend your original message.

Delivery attempts will continue to be made for 5  day(s).