Hello @david64,    What device are you using to access Post Office when you get 504 error? Both Desktop and Android using the latest web browser versions.   This is not a user-specific issue. It is affecting multiple users with the same symptoms and is intermittent despite no changes being made to any user-side configuration.   Does your mail client have a logging function? Not that I am aware of.   The broken pipe is not necessarily a bad password; the session could be dropping at that moment. Yes, I suspect the broken pipe to be due to a timeout (as is reproducible via the web).   Timeouts are symptomatic of an API or connectivity error. My guess is certain requests are being load-balanced to a particular faulty server, or the TPG to TMC gateway is not working properly for some accounts (despite TMC claiming that emails have not yet been migrated).   Mail senders don't just give up after one go; they try several times over many hours. My email tests are between internal TPG accounts (ie. from TPG to TPG) so any delays are due to system issues with TPG and not external providers.   Delays have started since a big change to remove TLS 1.0, and introduce a mechanism to handle transfer to TMC. If it is TLS related then it is probably caused by upstream server(s) that TPG's email server(s) are communicating with. It is not likely user-specific because most web browsers and email cients these days are not using TLS 1.0 (which was a standard in 1999).   My access to Post Office has generally been fine. Have had a few occasions using my tablet which could have been time (early in morning) or low wifi speed due to distance. Mail client has been ok also. This is not a connection quality issue. I can load and access various content-heavy websites without latency (eg. "outlook.com", "mail.com", "smh.com.au" etc).   Furthermore, this issue is affecting some TPG email accounts but not others (eg. "mdsl" works but not "mvanle2" or "ypanbbs"). Since you are not experiencing any problems I assume you are using an account that is not affected by this issue - however there is clearly an issue as it is affecting multiple email accounts from different TPG customers. ... View more