I have been using instantly.ai to send emails. I connected IONOS.ca and JustHost.com mailboxes to instantly and it works fine (warmup, receiving and sending [yes other emails receive the emails sent, and my mailbox inboxes show the warmup emails are coming in]). However, sent emails never show up in the webmail (IONOS.ca & JustHost.com mailboxes) sent folder.
I use SMTP/IMAP settings.
I tried speaking with instantly support, and IONOS.ca support, and JustHost.com support and they said it is the other persons problem... this is frustrating because it seems that nobody knows what is going on.
I do not know what to ask. Now I am at an impasse. I do not know what settings must be changed or edited.
Please help me figure out how to fix this issue myself or what is the correct question to ask support, so that emails sent through the instantly client show up in the sent folders on IONOS and JustHost mailboxes.
If you could tell me what I need to tell support, that would help a lot.
Thank you.
p.s. everything works perfectly well on Google mailboxes and Office365 mailboxes, but not IONOS and JustHost
p.s.s. I spoke with JustHost support and they changed some routing option and mx records and said it would help. It did not.