Dear {Mr./Mrs. Name},
I would like to apologize for any unsolicited emails that may have been sent to you in the past few {amount of time}. On {date}, my email account was hacked and a number of spam messages were sent out to contacts without my knowledge.
I hope that it goes without saying that I would never purposely bother clients or business associates with inane sales pitches and inappropriate product ads. Thank you for your understanding as I take steps to improve my password protection!
Sincerely,
{Sender}
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