Email address change
I thought I would share my experience changing the primary email address with providers. Many contact details can be changed without provider intervention, but often times an email change requires interaction with the support team.
Many providers allow self-service email address changes. As long as you have your client area and portal login, you may be able to change your email address yourself. Easy enough.
Often however, you can change your contact address, but your "owner" address that is associated with the client area login requires a ticket. In almost all cases I've seen a simple ticket request is all that is required to make this change. Although not all providers realize that there is the client area login email address and the contact address, both need to be changed, the former often by the provider.
As a customer, don't forget you may have the client area email and a control panel email. You'll probably need to change the portal email separately.
A few providers perform some verification such as an email to the old or new address. One provider asked that I send an email from both the old and new account to verify the change. Another asked for a payment id on a recent bill for verification. One provider demanded I present a government issued id. I promptly cancelled service with that provider.
Self-service is always nice, but I imagine the providers don't allow this are protecting accounts from hijacks? If so. some additional verification account verification (e.g. sending emails to or from both accounts) seems perfectly reasonable to me. Performing additional verification such as payment ids is not entirely unwarranted. Hopefully this happens infrequently since I hate creating any support tickets with LE providers, presumably their margins are thin enough without additional support burden.
If you lose access to an email, then additional verification through support seems both necessary and desirable. If that happened to me, I might want the provider to issue some additional challenge so I know they're being cautious.
Overall, almost all providers make this fairly painless, but there is a large degree of inconsistency. The process varies. I'd suggest providers put something in their knowledge base about changing email addresses. It seems almost no one does this.