Can anybody help with this? I don't want to have to change mail clients but it is impossible to write emails.

Am I posting this in the right site? It doesn't seem there is anyway to contact mozilla, and I don't seem to be getting any advice from this support forum. Is that because there is no solution or no one knows how to fix this? I hope someone can help

Thank you

Why does no one in all of Mozilla support have any suggestions? Even one suggestion would be great. Thank you

This is a user supported forum, so you won't always get support from someone at Mozilla.

However, it sounds like your problem is not from Thunderbird, but from a potential hardware or software issue. It could be a failing hard drive or some other software you are using that is filtering the response before writing to the drive. It really is hard to say without further information.

You should supply more information about your OS, other software running (like AV, etc) and hardware to expect further assistance.

Start your computer in Safe mode with networking and see if it works better.

Hi and thank you for replying.

Running Thunderbird 52.6.0 (64-bit)

@Airmail, I tried the safemode with networking, no change.

@DaCoob, I've tried it with all other software running, still no change.

Hardware Overview:

 Model Name:	MacBook Air
 Model Identifier:	MacBookAir7,2
 Processor Name:	Intel Core i7
 Processor Speed:	2,2 GHz
 Number of Processors:	1
 Total Number of Cores:	2
 L2 Cache (per Core):	256 KB
 L3 Cache:	4 MB
 Memory:	8 GB
 Boot ROM Version:	MBA71.0171.B00
 SMC Version (system):	2.27f2
 Serial Number (system):	C1MRC187G944
 Hardware UUID:	0917A2DF-8486-5AE4-9E2A-308A8A22D850

System Software Overview:

 System Version:	macOS 10.13.3 (17D102)
 Kernel Version:	Darwin 17.4.0
 Boot Mode:	Normal
 Secure Virtual Memory:	Enabled
 System Integrity Protection:	Enabled

Thanks everyone.