XF 2.2 Swift_TransportException Error: nested MAIL command


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I appear to have 220,000 of these errors..

  • Swift_TransportException: Email to XXXXX@XXXXX.org failed: Expected response code 250 but got code "503", with message "503 5.5.1 Error: nested MAIL command "
I don't know where it is getting the email from (obviously not the XXXXX one;).

The only thing I know is that the email address it keeps referencing, is an old email I used when setting up the forum, but I cannot find any reference to that address in the settings - which leads me to believe I just don't know where it is.

We no longer use the email address including the domain, as the site has been reposted to a new url.

The fact it has an old email address is the concern..
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