wow, it takes a long time to save a draft!
I'm using Thunderbird 52.9 on Mac OS 10.11. I write a short text e-mail, select a 13MB attachment, and save the e-mail to be sent later. It takes almost a minute to save it! Is this normal? Gosh, I could work more efficiently by just saving the e-mail without the attachment, and then doing the attaching just before I send. I can't think of any reason why this should take so long to save a 13MB e-mail. Is something on my system messed up?
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الحل المُختار
If this is an IMAP account and you're storing drafts on the IMAP server, it could easily take a minute to upload a 17 MB message (encoding adds about 1/3 of the attachment size) on an average connection. If you really don't need drafts kept in IMAP folders, change the location of the Drafts folder to Local Folders in Tools/Account Settings/accountname/Copies & Folders.
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الحل المُختار
If this is an IMAP account and you're storing drafts on the IMAP server, it could easily take a minute to upload a 17 MB message (encoding adds about 1/3 of the attachment size) on an average connection. If you really don't need drafts kept in IMAP folders, change the location of the Drafts folder to Local Folders in Tools/Account Settings/accountname/Copies & Folders.
Ah, that's right! It's an IMAP account. I stupidly was thinking that TB was just going to save it on the local machine, but no! It's uploading it to a Drafts folder in the cloud. Sheesh. Many thanks. That was the answer.