I know RadioMail Classic is no longer supported/updated but … in the last few days, I have been unable to complete exchanges on FM packet. It gets to “FF” and then goes no further, even when I can see/hear transmissions both coming in and going out. This is a new problem I have not seen before. It started after I started using a tactical address but happens whether or not the tactical address is enabled or not. It occurs whichever iOS device and transceiver I use, and on all Winlink gateways I have tried. It does not occur on Telnet.
The good news is, RadioMail 2.0 seems to work fine!