Trouble sending emails to IFTTT using WP as service, other emails work ok

Hi,

suddenly I experience problems when trying to send emails to IFTTT’s standard email for recipes [email protected]. The recipe creates a tweet with the newsletter subject line. I use the internal mail service which worked fine before for IFTTT and for other email addresses. I tried to email IFTTT from the newsletter’s email account directly, this works.

I verified that all email addresses are correct and recreated a recipe in IFTTT. Do you have any other ideas how to resolve this?

Thanks,

k.