Other email accounts: From a trusted device, sign in to your email account. A recipient's server could have blacklisted yours only. The reply text was "5.5.4 Invalid Address".' You may have an invalid recipient's address, misspelled the address, or it simply does not exist. SMTP … another thing i could send email using smtp.gmail.com server with this code, so my code doesn't have problem. dialog box appears. TLS is not the same as SSL. Authentication method mismatch between a server and a client. In the right pane, click the SMTP If the mail server requires a user name and password, Should I worry that some recipients won't be able to receive or read the email due to this encoding? 214 - A help message for a human reader follows. When I configure it through outlook using IMAP protocol it says: Send test e-mail message: None of the authentication methods supported by this client are supported by your server. Correct email format for Email with Plain, HTML and an Attachment in SMTP? Invalid authentication. Email is submitted by a mail client (mail user agent, MUA) to a mail server (mail submission agent, MSA) using SMTP on TCP port 587.Most mailbox providers still allow submission on traditional port 25. SMTP does not support Unicode characters. 1-210-366-3993, Copyright ©1996-2020 GlobalSCAPE, Inc. All rights reserved. tab in the administration interface and select the server that you To configure EFT to send email notifications. Whose smtp server are you using? Unicode support in protocols. Introduced with Postfix version3.0, this fully supports UTF-8 email addresses and UTF-8 messageheader values. RFC 6531 provides a mechanism for allowing non-ASCII email addresses encoded as UTF-8 in an SMTP or LMTP protocol; Unicode support in message header. An alternate HTML email body permits using