I work in the United Kingdom as a manager for a company which is based out of the United States.
This company has a number of very small overseas offices around the world.
All overseas office managers report to the same line manager based in the USA (let's call him John Smith).
There is some competition between overseas offices to meet targets.
Recently, our sales team sent both our Canadian office, and my office an email, asking about some new local procedures.
Unfortunately the sales team forgot to send the email to our U.K email distribution list (which I am part of), and only sent the email directly to two of my staff members who were on rostered days off. Whilst I was on shift that day, I was unaware of this email due to me not being copied.
I received an email today forwarded by the Canadian office manager, who enclosed the email from our sales team, and rudely said that "I am resending this email as we are still waiting for the UK office to reply". He also copied my manager 'John Smith', as well as other members of the head office management team. Frankly there was no reason to copy our management team, as this procedure email has nothing to do with them.
When the Canadian office manager forwarded the email and included our management team, he also went back to the original email from the sales team, and edited the 'To' field to make it look like the email was sent to our U.K email distribution group, instead of just to our two staff members.
This makes it look as if I purposely ignored this email while I was on shift, and paints me in a negative light.
I checked with my staff member today, and compared both emails - and confirmed that the "To" email field in the forwarded email from the Canadian office manager was definitely edited.
After discovering this, I immediately emailed our sales team directly, excluding the Canadian manager, and copying my manager - apologising for the delay in response, and explaining that I was not copied in this initial email and my team were on days off. I also included the original non-edited email, and also advised them that they could email me directly in the future.
I am thinking of also emailing the Canadian manager and copying my manager, explaining that the email was not sent to our group email, but was sent to two of my staff who were on rostered day off. However, I am also thinking of just ignoring it, as I have already sent the original email to my manager.
How should one approach this situation, particularly when the Canadian manager purposely edited the email to paint me in a bad light?