Unthinkingly I mentioned to the beloved, that I had changed email client. Now she wants an explanation.
So, how do I do a simple one?
When explaining things go non-techies, which I assume to be the case here, I sometimes try to find analogies in the non tech world.
I'd probably be thinking along lines of 'using different different paper', or maybe different stamps and/or getting the Post Office to deliver using different vans, or maybe getting it popped through the letterbox by a different Postie. At the same time emphasising that the sorting office (the server) and the remote sender/recipient would be unaware that your pen, paper, or colour of the delivery van, was any different.