Error 5.7.0 Must issue a STARTTLS command first

Carlos Oliveros Advanced User Posts: 30 Points: 53 Rating: 1 Authority: 1 Joined: 07 February 2008	#1 0 02 October 2025 12:22:43 Hello, Today I try to send an email and I received this error: 5.7.0 Must issue a STARTTLS command first And the email is not send. I´m using The Bat! Professional v11.4.3, POP3, with Windows 10 updated. How can resolve this? Thanks Best regards Edited: Carlos Oliveros - 02 October 2025 12:23:58

Miloš Radovanović Guru Posts: 568 Points: 1022 Rating: 8645 Authority: 8640 Joined: 30 September 2021	#2 0 03 October 2025 14:42:59 Never seen this, but check Account -> Properties -> Transport, whether STARTTLS is selected under Connection in Send mail.