Dear {Name},
I'm sorry for the repeat emails! In retrospect, I wish I had gathered all of my thoughts so I could present them without multiple follow-ups competing for your time and attention.
With that being said, there's one more thing (I hope) that I think you need to know. It's that {additional information}.
Please get back to me at your convenience. If you think this matter would be handled more efficiently via a phone call, feel free to reach out to me at {number}.
Sincerely,
{Sender}
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