Configuring SMTP Client

Often the default client setup is enough but sometimes it may become necessary to get more control of the connection with your SMTP server. In this discussion we discuss ways to customize the connection.

By default Red Mail uses STARTTLS or opportunistic TLS in connecting to the SMTP server. You may also change this if needed by changing the cls_smtp to other SMTP client classes from smtplib in standard library.

Note

Extra keyword arguments in EmailSender initiation are passed to the SMTP client. Please see the documentation of the SMTP client you are seeking.

STARTTLS

By default, Red Mail uses STARTTLS which is configured as this:

from redmail import EmailSender
from smtplib import SMTP

email = EmailSender(
    host="smtp.myhost.com",
    port=0,
    cls_smtp=SMTP,
    use_starttls=True
)

SMTP TLS

You may also continue using TLS:

from redmail import EmailSender

email = EmailSender(
    host="smtp.myhost.com",
    port=0,
    use_starttls=False
)

SMTP SSL

To use SSL:

from redmail import EmailSender
from smtplib import SMTP_SSL

email = EmailSender(
    host="smtp.myhost.com",
    port=0,
    cls_smtp=SMTP_SSL,
)

You may also pass the SSL context:

from redmail import EmailSender
from smtplib import SMTP_SSL
from ssl import SSLContext

email = EmailSender(
    host="smtp.myhost.com",
    port=0,
    cls_smtp=SMTP_SSL,
    context=SSLContext(...)
)

LMTP

To use LMTP:

from redmail import EmailSender
from smtplib import LMTP

email = EmailSender(
    host="smtp.myhost.com",
    port=0,
    cls_smtp=LMTP
)