[WOTLK CLASSIC] Internal Mail Database Error When Sending Heirlooms

I’m trying to mail my heirlooms from my horde main on Golemagg to my alliance alt on Earthshaker. However, every time I try to do this the mail doesn’t complete and I get a message saying internal mail database error. I’ve tried doing a full UI reset, uninstalling addon managers but this hasn’t fixed the problem. As far as I’m aware mailing heirlooms cross realm cross faction should be possible, wondering if anyone can provide any advice on this?

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