Post SMTP email error

  • Hello,

    Following a recent update about a month ago (more or less), Post SMTP stopped working and emails were no longer being sent from my site. A recent update alerted me to the problem, because now instead of nothing being sent, I am getting an email error message:

    You getting this message because an error detected while delivered your email.
    For the domain: https://farawaylandtravel.ca
    The log to paste when you open a support issue:
    Message rejected because [IP removed] is blacklisted see Blocked
    Too many failed logins

    I have double-checked my login credentials several times and they are correct. There is absolutely nothing wrong with my settings. Of course not, because everything worked perfectly before the update about a month ago.

    So I tried to send a test email and this is what I got:

    550-Message rejected because [IP removed] is blacklisted see Blocked
    550 – Too many failed logins

    How can this problem caused by Post SMTP be fixed?

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