plain authenticator failed – SMTP

plain authenticator failed – SMTP

I recently installed prestaShop and set E-mail settings to use SMTP instead of PHPmail, the SMTP settings are correct (like in MUAs), e-mails are sending/arriving OK to clients but suddenly I noticed getting that error in exim’s log everytime the shop sends an e-mail.


plain authenticator failed for ( []: 535 Incorrect authentication data (set_id=xxx@xxx.tld)

domain/mail obfuscated

So, that error occurs but e-mail is delivered OK.

When I change SMTP encryption settings from ‚none’ to eg. ‚TLS’ in prestaShop (as I’m using in MUAs like Thunderbird with NO error) here there is an error


SMTP protocol synchronization error (input sent without waiting for greeting): rejected connection from [] input="260301"

And of course no mail is sended.

In that case doing


openssl s_client -starttls smtp -crlf -connect

SSL handshake has read 2345 bytes and written 482 bytes
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 1024 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
    Protocol  : TLSv1
    Cipher    : DHE-RSA-AES256-SHA
    Session-ID: A68184AEDAA3D92629F7827BA67F9F8BC05EB53393AC2C764B8EE866F4BA5E1C
    Master-Key: 01E62FB5BEF415615DD53B25ACED3AB3849A580564B996EB3150A84882E25D73D727939F22E20AEABF4BE76EE7EAAFC5
    Key-Arg  : None
    Krb5 Principal: None
    Start Time: 1353063581
    Timeout  : 300 (sec)
    Verify return code: 18 (self signed certificate)
250 HELP

When I use eg. Thunderbird as the same outgoing server settings there is NO such error and mails are delivering NP. This is only script that sends emails using SMTP so I don’t know if it’s a DA specific case or prestaShop – if don’t – please feel free to delete this thread.

I’m using SpamBlocker4.1


    driver = plaintext
    public_name = PLAIN
    server_prompts = :
    server_condition = "${perl{smtpauth}}"
    server_set_id = $2

As for now I stuck with SMTP Encryption ‚None’ mails sending but full of errors in logs.

Thanks in advance for any clue.

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