Using scripts to ensure each unique email address appears only once.
: If your bounce rate creeps above 2%, ESPs like Gmail may start flagging your domain as a spam source. email list txt repack
grep -E '^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]2,$' step3_deduped.txt > step4_valid.txt Using scripts to ensure each unique email address