We'd never get you to say sorry for sending an adorable cat picture.
In the email - which was titled "meeting" - was an image of a tabby cat dressed as the Cookie Monster and holding a plate of choc-chip biscuits.
"Sorry to disappoint those of you who were hoping to attend this "cat pajama-jam" party, but such an event falls well outside our area of expertise", he wrote in a follow-up email two days after the original.
The email, which has been cited as a "training error", was sent from the United States' embassy in Canberra, Australia as a fake meeting invitation.
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Perhaps they needn't have apologised, 'cos it's a cute cat.
Sundwall added that "strong new management controls" would be implemented to prevent the mistake from happening again.
There was no cat pajama party, but it was very appreciated by social media users, who wanted to RSVP, "yes".
The embassy said a "training error" was to blame for the email, which was sent by the US Department of State to an unknown number of recipients, the Sydney Morning Herald reports. The article has been updated to reflect this.