Gateway SMTP or SMTP gateway also transfers emails among various servers but, in contrast to SMTP relay, it’s authorized to remodel the information if necessary. SMTP gateways are frequently firewalls that rewrite addresses or middleman SMTP servers. MUA (Mail Consumer Agent) is definitely the email client we mentioned earlier https://www.upwork.com/services/product/development-it-setup-web-conferencing-system-using-bigbluebutton-and-scalelite-1446381070830473216?ref=project_share&tier=0