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SOLVED 550 Invalid RCPT (thank you for using SPF)

Discussion in 'E-mail Discussions' started by WorkinOnIt, Mar 3, 2017.

  1. WorkinOnIt

    WorkinOnIt Well-Known Member

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    Hello team

    I hope you are doing great! I am wondering if you can assist with the following. I know there are many topics on this issue - though mine seems to be unique as far as I can tell !!

    I keep getting mail bouncing back to one single email address and I cannot seem to identify where/what the issue is - whether this is a setting on my server - or if it is the remote server. There are no other issues on my server.

    Email has been working fine to the recipient - until yesterday and now I get a bounce back (below) from my server - regardless of what I send them. There have been no changes on my server (other than a recent upgrade to version 62 build 15).

    I am hoping you might be able to tell me if this is an issue with their domain or with the receiving server - or if I should add something to my cpanel config?


    I have not seen this exact message before - especially the 550 Invalid RCPT "thank you for using SPF" - which I have googled but found no matches!!

    I've checked my sending server IP in blacklists and all is fine. However, I did notice that their domain does not have an SPF record. Could that be the issue - though I assumed SPF was more for "sending" rather than receiving (Sender Policy Framework). Could the absence of an SPF cause recipient issues?

    Strangely - if they send me an email - I seem to be able to reply without issue. Also I tried send them an email from my personal Gmail account - that bounced too.

    I have contacted their domain host and waiting for their reply - perhaps my sending server is blocked by them?

    Thanks in advance.
     
    #1 WorkinOnIt, Mar 3, 2017
    Last edited: Mar 3, 2017
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    Could you search one of the affected messages in /var/log/exim_mainlog and let us know the output? EX:

    Code:
    exigrep user@domain /var/log/exim_mainlog
    Thank you.
     
  3. WorkinOnIt

    WorkinOnIt Well-Known Member

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    Hello - problem solved - I finally discovered the mail host had inadvertently suspended the account without any notification to the customer! Needless to say, problem solved by moving them to a new host!
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    I'm happy to see you were able to determine the cause of the problem. Thank you for updating us with the outcome.
     
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