mac mail and bt mail account
History: I have been a customer of BT at **** using mail to send and receive mail for 10yrs+. Joined bt infinity jan 2016 all ok using mac mal account with BT (os10.11.6). Then beginning of August outward mail could not be sent hung up in out box for 24hrs.
Consulted bt help, I was told they did not use third party software (gmail account successfully running with third party mac mail on my macbook pro) and this is an apple problem and that I need to consult their recommended software engineer to sort it out.
Posed this question to bt and still waiting for answer "can you answer why i have had the service for the past 10 years using an account in mac mail and mal.wolf@btinternet but now I cannot even send emails from mac mail?"
My question to the community is how many mac users are there in similar frustrating position as I am?
And to Apple once and for all is it a problem with mac mail as bt are saying and are there a solution/s?
I am tending to feel like a tennis ball in the middle of two players Please help!
<Personal Information Edited by Host>
MacBook Pro, OS X El Capitan (10.11.6), null