We would have to make an announcement and send out an email to customers on these servers to let them know that the port has been changed and 26 is no longer used.
We would rather enable only one extra port for SMTP, so we will send out emails now to SH96, SH91 and Pass58 customers letting them know, and change the port in a few hours. We've decided to use 198. (S is the 19th letter of the alphabet, H is the 8th.)
We can make this change on other servers, just need to get in the requests here so that we know you want the change done.