email send problem - Bell Sympatico
This may not be a Bell problem but they are my ISP.
I am having problems sending emails. This problem has been noticed over the past few weeks but could have been going on longer. When I send an email it goes into the sent box so it looks like a successful send but it has not gone to the receiver. I have started putting my own address as a bcc so that I have a better idea if the message has been successfully sent. If I restart the email client it makes no difference but if I reboot my laptop the new emails will get sent but eventually (within minutes/hours) will not be sent.
Current set up:
Win 10, Norton Security, Bell Canada ISP (Sympatico not Fibe), Mozilla Thunderbird (POP3 & SMTP)
I have tried Windows Live Mail, Opera and eM Client and they all do exactly the same. Win 10 Mail seems to work okay but I wouldnĺt want to use it as my everyday email client. I have disabled Norton and it makes no difference. I have used 2 different locations with different routers with no difference.