Comment 1 for bug 1905962

While it is true that https://www.rfc-editor.org/rfc/rfc5321.html#section-4.5.3.1.1 says:

   The maximum total length of a user name or other local-part is 64
   octets.

https://www.rfc-editor.org/rfc/rfc5321.html#section-4.5.3.1 says:

   However, some Internet mail constructs such as encoded
   X.400 addresses (RFC 2156 [35]) will often require larger objects.
   Clients MAY attempt to transmit these, but MUST be prepared for a
   server to reject them if they cannot be handled by it. To the
   maximum extent possible, implementation techniques that impose no
   limits on the length of these objects should be used.

As I read this, It is OK for an envelope sender local part to be longer than 64 octets as long as we are prepared for a reject, and MTAs should if possible be implemented to accept these. Also, I tested with Postfix and there was no problem sending my test which had an envelope sender local part of 104 octets. Thus, I don't want to disable VERP arbitrarily just because the VERPed local part exceeds 64 octets.