IMAP w/ OVH-send email failed w/ error 550-5.7.0 Mail quota exceeded

[alrisrail]

Hello,

I regularly can't send email from espoCRM thru my IMAP integration with OVH mailbox.
I do send 4 to 5 email per day.
But from time to time, espoCRM cannot send the email with this strange error message that I sent too many message which is clearly not the case.
"you have exceeded the limit of 200 messages per hour and per account"

Could someone help me understanding what the matter is ?
Moreover, then the message stay in status "sending" in the Database and is no more accessible in espoCRM.
No way to re send it. (appart changing the status to draft with SQL command)

Attachjed logs

Thank you for your help

Christophe

[victor]

You have exceeded the limit of 200 messages per hour and per account.

This error indicates that your email provider's SMTP server is throttling you. Their limit takes into account absolutely all emails you send from different services.

I would advise to check:

- whether there are no mass mailings or workflows in EspoCRM;
- whether the same email is used in other programs;
- SMTP logs or sending statistics in OVH;
- whether there was any suspicious activity on the email account (change the password to check).

It is also worth clarifying is the mailbox used exclusively by EspoCRM, or is it also used in Outlook, webmail, mobile devices, or other applications? The SMTP error is returned directly by OVH, so the next step would be to verify the actual sending statistics on the OVH side and determine what generated the 200+ messages counted during that hour.