Every time I send an email to my subscriber list, I get a bounce from verzion.net (with an "over quota" error), but it does not say anywhere in the bounce message what the email address was that triggered the bounce. I would like to have a "clean" list and remove any addresses that bounce. How can I deal with this? Here's part of the bounce (with my domain replaced with myserver.com):
Your message cannot be delivered to the following recipients:
Recipient address: @resst169053v.mailsrvcs.net:resx595p@ims-ms-daemon
Original address: [email protected]
Reason: LMTP transmission failure has occurred
Diagnostic code: lmtp;550 5.2.2 Delivery failed: Over quota
Remote system: dns;resst169053v.mailsrvcs.net (TCP|172.19.172.47|58773|172.19.169.54|225)
Does your mailing list software support VERP? Most all of them do. VERP is the canonical answer to these types of issues - it encodes the recipient's email address into the envelope sender's address. This way when there's a bounce, it's sent back, and you can tell who the original recipient was by looking at what email address the NDR was sent to.
If you can specify the email addresses you send out to, you can narrow it down exponentially by halving your list.
Send a message to half your list. If the address doesn't bounce, it's not in that half. Repeat. For 1,000,000 addresses, this will take you about 20 total messages.