Changes at Postmark April 13, 2021

[tsp666]

Hi,
this is not an issue, rather a question if issues could arise.

From Postmark:
On April 13, 2021, we are going to (1) disable TLSv1 access, (2) disable all RC4 and low-strength ciphers, and (3) add HSTS headers.

as the endpoint in this extension cannot get changed to the testing endpoint, there is no way to see if these changes would affect the sending - thus this issue report/query.

Many thanks for an answer!
Torsten