Requesting help, email deliverability
Last week i was emailing my contacts with a template and it was going fine. Today I was emailing new contacts with a template and everytime after a while I got the notification that "There is an issue delivering your email" meaning the mails were not send. In the faqs there were a lot of possible causes but non of them applied to my case.
A moment later I saw in one of my new contacts, which had the same "non delivery" notification the remarks that he had opened the mail and clicked the link.
Now I am wondering; were the mails to my new contact send Yes or No? (all of them had the notification "delivery issues"). If they were send it's very frustrating since I've tried sending a couple of times so then contacts would receive more of the same mails. (feeling spammed)
If they were not send, how on earth did I get the notification that a contact opened his mail?
Could someone help me with this mistery?