5.7.0 SMTP; 503 5.7.0 encryption too weak 0 less than 128

Discussion in 'Mail Server Support' started by popowich, Sep 27, 2010.

  1. popowich

    popowich EQ Forum Admin Staff Member

    Aug 12, 2008
    Likes Received:
    If you are receiving an error with wording similar to "encryption too weak 0 less than 128" then you are likely trying to send email to a mail server that requires encryption but sending from a mail server that does not support encryption.

    A possible solution for Microsoft Exchange 2007 mail servers is :

    A possible solution for sendmail mail servers is removing lines such as the following from your sendmail.mc file :

    TLS_Clt: ENCR:128
    TLS_Srv: ENCR:128
    TLS_Rcpt: ENCR:128

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