https://www.123articleonline.com/rss/author/453296/email-checker-bulkArticles written by email checker bulk from 123ArticleOnline.comen-usCopyright (c) 123ArticleOnline.com All rights reserved. https://www.123articleonline.com/articles/1509502/email-checker-the-ultimate-guide-best-tools-to-use Yet another critical part of the process, the instrument, attempts to send an email to the target email address by directly conversing with the recipient's Mail Transfer Agent (MTA). In a process known as an SMTP handshake, the instrument aims to verify the existence of the mailbox (the local part of the email address, the portion that appears before the '@' symbol) on that mail server. The instrument opens a connection to the mail server and queries the server for the existence of the user, but does not send an email. The server responds to the instrument and the server's response determines whether the email address is deliverable, undeliverable, or some catch-all (i.e. a server that accepts any emails addressed to a domain, irrespective of validity of the recipient email address).