This might seem to be a very tiny thing but I am trying to keep my finances and child arrangements very clear and have asked my ex from the outset to correspond in emails.
This was partly because I had a very basic phone in the past which couldn't cope with long emails, kept getting angry ranty long emails and wanted to formalise it and make chid care dates & times clear, so that I could put it in the diary and my daughter was clear when she would see her dad.
I think psychologically as well as practically, I wanted to keep correspondence in one place and in the same format so there was no confusion eg Mon 1st Jan, 10-6 and minimise contact.
But what a palava!! He still insists on texting me and 'difficulty' with sending me emails. The fault is 'my end' of course. Maybe I am denying that I have ever received them. There has been alot of tooing and froing where he has struggled to 'email'. I have suggested that he asks someone to help him (which didn't go down well).
Part of me wonders if its a control thing. That he can drop me texts whenever he feels like it (usually angry or demanding). Hes not great on IT but can send emails. Unlikely that its an IT issue more like a human issue.
How do you practically make your childcare arrangements?
Have you considered making a parenting plan? This would detail the ongoing arrangements relating to child arrangements, including holidays, half-terms, Mothers/Fathers Day, Christmas/Easter/Eid/Hanukkah/etc
This would then remove the need for constant contact about child arrangements, and allow both parents to plan activities etc when the child is with them. It will also provide a sense of stability and continuity for the child.