We have developed a feature that creates reservations. The client receives an email containing a link which is clickable only once.Some of those reservations fail and I can't figure out why. I think that some mail clients (incl. webbased) check the links inside a mail before exposing the mail to the reader. Maybe due to malware scanning, tracking, status code checks,.. Question: Do you know any mail client which behaves like that?Bonus question: Do those clients stop when the url is defined in robots.txt ?Edit: I'm currently checking access.log for those links and try to find different access to the reservation links. Hour log files are HUGE and this takes like forever on several servers..
Mailclients checking Links inside mail
email;links;clients;webmail