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Re: [ietf-smtp] Proposal: Updating VERP Specification

2019-12-13 18:10:06
Viruthagiri Thirumavalavan writes:

   I don't see any way around this. I see no other ways to handle this.

I'm not sure how viable this method is. I think the client should look for MAIL FROM command response and then retry with a non VERP address when the local-part exceed 64 characters.
501 Syntax error in parameters or arguments
455  Server unable to accommodate parameters
555  MAIL FROM/RCPT TO parameters not recognized or not implemented

I see this as a trade-off. This is gambling that if this gets forwarded on with the original list of recipients, as is, any eventual bounce will be a parsable DSN. But if it's not, the original purpose of using VERPs – which is always being able to identify a bouncing address – has been defeated. Now, the mail robots is going to get stuck with undeliverable addresses that will bounce forever, and cannot be identified.

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