SimpleLogin review
For a new booking service, I’d make a separate email address in SimpleLogin. The confirmation still arrives in my usual inbox. Months later, if the address starts drawing junk, I can see which signup it belonged to and switch that one address off.
Reply from the inbox you already use
When someone emails an alias, SimpleLogin forwards the message with a reply address tied to that sender and alias. Hitting Reply sends the answer back through SimpleLogin from the alias. I’d still check the signature in my mail app, since a signature can give away the address or phone number I wanted to keep separate. For a conversation that belongs in chat, I’d use a SimpleX Chat invitation instead. An alias is useful when the other person needs to reach me by ordinary email.
Disable the address before deleting it
I’d pause a noisy alias first. If the messages came from a single sender I still recognised, I could block that sender and leave the address active for everyone else. Before deleting an alias I’d check whether a service still uses it for password resets. Replacing it in the account settings while I still have access is easier than finding out at the next sign-in.
Anabel’s take
The address I’d be most careful with is the one that receives my domain renewal. I’d label that alias with the registrar’s name so I don’t turn off an important reminder while cleaning up old signups.