The client desires to send to a few recipients. The server acknowledges Jones and Brown with 250 Alright replies, but sends a 550 mistake reply to point that it doesn’t figure out Green. Overfeeding your friends – negative. Overloading your recipients with too many emails – is also undesirable. https://it-support44444.dreamyblogs.com/27147073/top-guidelines-of-bulk-email-blast