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SMTP / STARTTLS ISSUES

JonS

Member
Just seeing if anyone has found a solution to this.

Using office365mail. When trying to send email through pabbly via SMTP instead of the office365 option (as I am going to use a mailbox), keep getting the SMTP: Authentication error.

If I try using smtper.net to test the mail account I get the error:

SMTP send error
Error in processing. The server response was: 5.7.3 STARTTLS is required to send mail [YQBPR0101CA0238.CANPRD01.PROD.OUTLOOK.COM 2025-02-18T15:01:14.195Z 08DD4F599A63C9E9]

Any ideas? Cannot send the mail via SMTP any way i can think of using the hostname smtp.office365.com and I know I have been able to in the past.

Using port 587. Tried the authentication option too but makes no difference. Microsoft have spent an hour trying to fix but had to give up today and picking back up tomorrow.
 
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