The Transport Layer Security (TLS) protocol encrypts all traffic
between the email-sending application and SMTP server. TLS is the successor
to SSL and very similar to it.
SMTP servers including Google's popular free smtp.gmail.com
require TLS and reject all non-TLS-compliant email clients
by generating the error above.
The versions of AspEmail prior to 5.1
do not support TLS and therefore cannot be used with SMTP servers
requiring it, including smtp.gmail.com.
AspEmail 5.1+ does support TLS. To use AspEmail with a TLS-enabled SMTP server,
you need to set the property TLS to True, as follows:
Mail.Host = "smtp.gmail.com"
Mail.Username = "MyGmailAccount"
Mail.Password = "He!!o^World!"
Mail.TLS = True
To download the latest version of AspEmail, please visit www.aspemail.com.
Upgrades are free for registered users.