Hi, I know 95% likely NOT to be Thunderbird but hoped someone might have some advise. With TSOHost & they recently migrated me to xxxxxxxxxxxx.prod.sxb1.secureserver.net (no choice) I think this is a GoDaddy server. emails use to Go instantly (talking about the delay between pressing send & it going, so I can go on to the next. Not how long it takes to get to the received. Now 4 to 10 seconds, I guess 6 or 7 seconds on average. Short emails, no attachments, size seems to make no difference. SSL & ports etc. all seem fine, it works, just slow. Not changed anything else in TB apart from the server name. Is faster direct from webmail but prob. around 4 seconds. Thankfully receiving is just as fast as before, again the update of what is shown, not from X to Y. TSOHost once moved me in error & I had similar slow but also on receive, might open TB & it was 10 - 20 seconds, I think even longer, before incoming were show & updated. I got them to move me back. I think then it was GoDaddy underneath. TSOHost say its down to the client, which seems unlikely if the day before migration it was OK. Any advise/ideas. May not seem a lot but doing through lots of short emails, it does slow you down. Can't see how virus detection could be involved, as nothing changed, perhaps a difference server, Windows defender is doing some more stuff, wild guess?