Dear {Name},
Thank you so much for the reminder email about {project}. You sending it apparently prompted my email program to realize that this is important, because it seems your initial message went straight to my spam folder. Argh!
I will get started on the project right away. I'll also double-check my email filters to see how I might be able to avoid missing messages in the future.
Appreciatively,
{Name}
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Index of letter of apology templates