Sounds too long-winded and personal, in my opinion. Instead of talking to the
person, I would talk about the e-mail. Short and sweet.
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
whoever(_at_)domain(_dot_)tld
error: spf softfail (POSSIBLE FORGERY)
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