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thierry,

If I make a "reply all" to that mail I've receive, It fills the
recipients of that reply.

What does it put in the To (or CC) fields? You might expect it to be your non-subscriber address (the one that sent the message) plus the group's posting address.

But Reply All is one of those features which operates somewhat differently at different email interfaces.

And, It adds an mail address as recipient that ends with :
"groups.io@%!s". Obviously it"s an non valid email address.

Can you examine the header of the message you received? Of interest are the From, To, CC, List-Id, and Reply-To fields. Maybe also Sender, if there is one. These are the fields normally used, in some fashion, by an email interface's Reply and Reply All functions.

If that oddball address is in one of those fields, then we'd also want to look at the header fields of the message as you sent it (from your non-subscriber address). Your email interface for that address may let you see a copy of what it thinks it sent, but it would be better to send another message to the integration address, and this time CC yourself directly (at an address where you can examine the received message's header).

Comparing those two sets of fields (on the way in to Groups.io, and on the way out from it) will likely reveal the origin of the oddball address.

Shal


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