[email protected], @txt.att.net.Parallel delivery with per-SMTP limits, weighting, and warm-up.
Use parallel SMTPs; map numbers to gateways like [email protected].
Catch obvious input errors before sending.
Reduce bounces and keep lists clean.
Helps with deliverability and diagnostics.
Examples: @txt.att.net, @vtext.com, @tmomail.net.