10 relays is a lot. 2-3 works much better in my experience, it also saves a lot of bandwidth. the error you mention is a relay rejecting your event for some reason. need to improve the feedback for each relay so you can weed out the bad apples.
10 relays is a lot. 2-3 works much better in my experience, it also saves a lot of bandwidth. the error you mention is a relay rejecting your event for some reason. need to improve the feedback for each relay so you can weed out the bad apples.