501 - 5.1.7 Bad sender's mailbox address syntax

published on 13/06/2011
updated on
18/08/2021

Extract from the RFC 3463 -Enhanced Mail System Status Codes :

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X.1.7   Bad sender's mailbox address syntax

The sender's address was syntactically invalid.This can apply to any field in the address.

X.1.8   Bad sender's system address

The sender's system specified in the address does not exist or
is incapable of accepting return mail.  For domain names, this
means the address portion to the right of the "@" is invalid
for mail.

If this happens to you, call in a specialist!

The author

Jonathan Loriaux

Active for more than ten years in emailing, my career path started on the technical side (integration of emailing campaigns) before turning to sales (as an eCRM expert) and finally to marketing consulting. For 9 years I have been the author of the blog Badsender.com. Emailing is not only an expertise, it really became my passion, that's why Badsender is now my main activity with the creation of an emailing consultant activity linked to the website.

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2 réponses

Matthieu dit :

15/06/2011 à 0h38

Hello,

Is the data still reliable from 2003?

Sincerely,
Matthieu
Jonathan Loriaux dit :

15/06/2011 à 9h21

Hello Matthieu,

A priori, an RFC is made to last 😉

But on the other hand, the implementation of this RFC by the various email servers will not always be up to the standard!

A+

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