Otherwise, servers with high levels of security may refuse to work with you. When you send e-mail, the recipient's SMTP server asks for your domain name. It is recommended that you use your real domain. If the domain is not specified, the program will try to determine your domain itself. The use of somebody else's domain or localhost alias is allowed but not recommended - servers with high levels of security may refuse to work with you.
Any person known to be a spammer has e-mail address on a blacklist.
Many SMTP servers rely on that blacklist to refuse relaying messages from spammers. You also will be unable to validate the addresses that belongs to the banned SMTP server. All product and company names are trademarks or registered trademarks of their respective owners. All rights reserved. Privacy statement .