I have the same problem sending emails with hestia and the oracle cloud email. Its NOT a free tier account!
An: exinext [email protected] shows:
Transport: smtp.email.eu-frankfurt-1.oci.oraclecloud.com :587 error -42: authentication required but no common mechanisms were found
I read this instruction several times:
https://blogs.oracle.com/cloud-infrastructure/post/step-by-step-instructions-to-send-email-with-oci-email-delivery
and I can send Emails with the Python script named ociemail.py.
But when I place my data into hestia Global relay it doesn’t send emails.
Any ideas how to fix that problem?
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I assume you already posted it here:
I have no idea how to fix it.
Hi Eris! Yes you are right - I posted it also on github because Im very desperate to find a solution for this problem. 
But it could not be that Im the only one with this problem?! 
I have tried it and even contacted their support about it. Wasn’t able to get it working…
After a few hours wasted I killed the test server…
To send emails on a Oracle Free Tier server is not possible. You have to switch to a “registered” one. Its also free but gives the possibility to send emails.
What I dont unterstand ist this error in the logfile
authentication required but no common mechanisms were found
because TLS has been enabled in hestia. Or is it an exim4 problem?
I do have a registered account and have the same issue…
But had the same error / issue but I have no idea.
Have no issues with other smtp providers
Strange. I tested it also with a freenet accountas relay - same problem.
[email protected] R=send_via_smtp_relay T=smtp_relay_smtp defer (-54): retry time not reached for any host for 'freenet.de'
There must be an resolver problem. What SMTP hoster are you taking?
That is because port 25 is blocked
I have used SMTP2GO but with my other VPS servers. I mainly use Oracle Cloud for building Hestia at the moment …
Ill try it out. We are not alone with the problem:
Any common issue is Oracle Cloud…
I thought that hestia send emails via TLS Port 587 - why we need Port 25? Im wondering about that because I can send emails outside to any recipient with this python script from oracle. There must be a problem on hestia side… 
# python script for sending SMTP configuration with Oracle Cloud Infrastructure Email Delivery
import smtplib
import email.utils
from email.message import EmailMessage
import ssl
# Replace [email protected] with your "From" address.
# This address must be verified.
# this is the approved sender email
SENDER = '[email protected]'
SENDERNAME = 'Blog Test Sender'
# Replace [email protected] with a "To" address. If your account
# is still in the sandbox, this address must be verified.
RECIPIENT = '[email protected]'
# Replace the USERNAME_SMTP value with your Email Delivery SMTP username.
USERNAME_SMTP = 'my_smtp_credential_username'
# Put the PASSWORD value from your Email Delivery SMTP password into the following file.
PASSWORD_SMTP_FILE = 'ociemail.config'
# If you’re using Email Delivery in a different region, replace the HOST value with an appropriate SMTP endpoint.
# Use port 25 or 587 to connect to the SMTP endpoint.
HOST = "smtp.us-ashburn-1.oraclecloud.com"
PORT = 587
# The subject line of the email.
SUBJECT = 'Email Delivery Blog Test'
# The email body for recipients with non-HTML email clients.
BODY_TEXT = (
"This email was sent through the Email Delivery SMTP "
"Interface using the Python smtplib package."
)
# get the password from a named config file ociemail.config
with open(PASSWORD_SMTP_FILE) as f:
password_smtp = f.readline().strip()
# create message container
msg = EmailMessage()
msg['Subject'] = SUBJECT
msg['From'] = email.utils.formataddr((SENDERNAME, SENDER))
msg['To'] = RECIPIENT
# make the message multi-part alternative, making the content the first part
msg.add_alternative(BODY_TEXT, subtype='text')
# Try to send the message.
try:
server = smtplib.SMTP(HOST, PORT)
server.ehlo()
# most python runtimes default to a set of trusted public CAs that will include the CA used by OCI Email Delivery.
# However, on platforms lacking that default (or with an outdated set of CAs), customers may need to provide a capath that includes our public CA.
server.starttls(context=ssl.create_default_context(purpose=ssl.Purpose.SERVER_AUTH, cafile=None, capath=None))
# smtplib docs recommend calling ehlo() before & after starttls()
server.ehlo()
server.login(USERNAME_SMTP, password_smtp)
# our requirement is that SENDER is the same as From address set previously
server.sendmail(SENDER, RECIPIENT, msg.as_string())
server.close()
# Display an error message if something goes wrong.
except Exception as e:
print(f"Error: {e}")
else:
print("Email successfully sent!")
So Im investigating that problem an I placed my oracle SMTP data into thunderbird.
And I can send emails via oracle cloud. So now Im sure that it must be an hestia / exim4 bug.
Or what do you think?
I have no idea it might be an issue with Exim4 as we use it.
But my exim4 knowledge is not a lot … And really don’t know where to start debugging. And as Oracle cloud smtp server is the only issue I don’t plan to put a lot of time into it…
… ok Ill ask the oracle support because SMTP2GO is a little bit to expansive for me 
Free for the first 1000 email?
Then 10 euro for the 10000 email / month ?
thats cheap!
Nevertheless, it is a challenge for me to figure out how to configure exim correctly
After googling many hours i found solution, meybe just workaround.
I change smt_relay_login in authentication section in file /etc/exim4/exim4.conf.template
(panel->server settings->edit exim4 or http:///edit/server/exim4/) to:
smtp_relay_login:
driver = plaintext
public_name = PLAIN
hide client_send = ^SMTP_RELAY_USER^SMTP_RELAY_PASS
… and it starts works.
Thanks to this document 33. SMTP authentication
Good Luck.
3 Likes
Look at my post.
Good Luck
https://forum.hestiacp.com/t/oracle-cloud-email-as-relay-doesnt-works/11304/19?u=atamann1
1 Like