Security upgrades to SMTP sending (action may be required)
We wanted to let you know about a few changes we’re making to SMTP sending in the coming weeks to make this endpoint more secure. These changes will only affect sending via SMTP. If you use only the Postmark REST API to send, no further action is required on your part.
The most significant change, which might affect you, is that we are disabling TLSv1 on December 14, 2019. This protocol is old and vulnerable, so we will be rejecting connection requests that use TLSv1.
Details and how to update your application →
Template comparison tool improvements