Not sure if this is a normal concern or not. My T and I have quite a good rapport, and we usually keep in contact via her number [to schedule sessions]. I've seen multiple references of associating with T's via e-mail on this forum, so I figured having their email was in the norm. For those members here that do talk to their T's via email, few questions:

Do you use it to set up appointment times or to talk? (Because I thought excessive contact outside the office was unethical/breaking boundaries) Do/did you have other methods of contact for them to start with? If email exchanges are a regular thing, how did this start occurring?

Anyway, reason I'm bringing this up is because people don't have the same number forever, and I'm an anxious person. They do usually keep the same email, though, which is why I want my hers, just in case anything goes wrong on my end or her end. I don't want to spill all this out to her though, as I imagine it might come off as being borderline clingy. How should I ask my T for email considering I already have her #?