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Guest Mexagon.Net

MTP server error: 5.7.0 Must issue a STARTTLS command first

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Guest Mexagon.Net

I can not operate the listmessenger system with the SMTP option, it always marks me the error:

Tue, 05 Jun 2018 16:57:11 +0000 listmessenger/sender.php [Line: 263] Unable to send message to xxxx@xxxx.xxx. LM_Mailer responded: The following From address failed: xxx@xxxx.com<p>SMTP server error: 5.7.0 Must issue a STARTTLS command first

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