ASCII-Codec in Python3 [SOLVED]

[AlphaInc]

The documentation of smtplib.SMTP.sendmail() says

msg may be a string containing characters in the ASCII range, or a byte
string. A string is encoded to bytes using the ascii codec, and lone
\r and \n characters are converted to \r\n characters.

As you want to send a string containing characters outside the ASCII range, I suggest that you encode the string manually using another encoding, such as utf8, so try this

msg = (headers + "\r\n\r\n" + content).encode('utf8')
session.sendmail(GMAIL_USERNAME, recipient, msg)

Thanks for your reply.
I edited the ending of my file to this (I hope you meant that).

        #Send Email & Exit
        msg = (headers + "\r\n\r\n" + content).encode('utf8')
        session.sendmail(GMAIL_USERNAME, recipient, msg)
        session.quit

sender = Emailer()

sendTo = receiver
emailSubject = "Subject"
emailContent = "ÄÖÜ"

#Sends an email to the "sendTo" address with the specified "emailSubject" as the subject and "emailConten$
sender.sendmail(sendTo, emailSubject, emailContent)

When I try to execute it I get the following error:

  File "debug2.py", line 40
    msg = (headers + "\r\n\r\n" + content).encode('utf8')
                                                        ^
TabError: inconsistent use of tabs and spaces in indentation

I don't see the error here tbh.