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SMTP errors Troubleshooting

Time to read: 7 min

Q1.: When sending test email I see error 250 code msg. 

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A.: Default email address (noreply@aff2mail.com) has a limit of emails to be sent. Error 250 code msg means the limit is over. We strongly recommend you to always set your custom email account instead of the default one.

Q2: When sending test email I see error 535 code msg.

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A.: Code 535 means the email account has a set of the two-steps verification turned ON and/or access to third-party services is not allowed.

The steps below describe how to turn two-steps verification off and grant access for third-party service in Gmail account:

Step 1: Sign in to your Gmail account and navigate to 'Account (settings)' -> 'Sign-in & security' Tab:

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Step 2: Turn off two-step verification:

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Step 3: There's also an option to grant access to a specific application. Kindly follow the Gmail guide to proceed.

Q3.: When sending a test email I see 220 code with "" error.

“Connection error, check settings. Err=[Expected response code 220 but got code “” , with message “”]” 

 A.: Such an error means that the email account has a set of the Less secure app access turned ON.

The steps below describe how to turn Less secure app access off in Gmail account:

Step 1: Sign in to your Gmail account and navigate to 'Account (settings)' -> 'Sign-in & security' Tab:

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Step 2Turn off less secure app access:

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Step 3:  For more information on how to resolve such a query, follow this link.

 import.pngIf Yandex/Mail/or any other mail service has the same option in the Settings, it should be switched off on the relevant settings page.

Q4.: My affiliate does not receive email notifications or see ‘Error of registration’ while sign up

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A.: 
Step 1: Make a test email to your email account:

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Step 2: Proceed with steps described in the FAQ to resolve error 250/535 code msg.
Step 3: If no error msg is observed and test email is passed successfully, check your spam box.

 

Q5.: When sending a test email I see a "Failed to authenticate on SMTP server with username..." error.

A.: The most secure way to send mails is to use SMTP authentication. But this authentication can sometimes fail with the error:

Err=[Failed to authenticate on SMTP server with username "example@example.ru 
using 3 possible authenticators]

or

Err=[Failed to authenticate on SMTP server with username "example@example.com 
using 3 possible authenticators]

Such an error means that the email account has a set of the Less secure app access turned ON.

The steps below describe how to turn Less secure app access off in a Yandex account:

Step 1: Sign in to your Yandex account and check your Outbox folder. Are there any messages in your Outbox folder?

Step 2: Enable two-step verification (2SV).

Step 3: Activate encrypted data transfer via SSL (TLS) in the Settings.

To do that, 

  1. open your browser and log into your Yandex account
  2. go into your Inbox and select the Settings icon   Markup 2021-02-08 at 13.51.24.png
  3. select All settings (Все настройки) Markup 2021-02-08 at 13.53.11.png
  4. Select Email clients (Почтовые программы)  Markup 2021-02-08 at 13.54.23.png
  5. Enable two following options and click the save changes (сохранить изменения) button: Markup 2021-02-08 at 14.00.05.png

The steps below describe how to turn Less secure app access off in a Gmail account:

Step 1:

If you are using a Gmail account, you should enable two-step verification (2SV). This has side effects that will impact your use of the account. See Two Step Verification (2FA).

Sign in to your Gmail account and navigate to Account (settings) -> Sign-in & security Tab -> Signing in to Google -> 2-Step Verification -> OFF

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Step 2Turn off less secure app access:

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If 2SV is not enabled, you should enable access for less secure apps: sign into the account, then go to Less secure app access. Under Security, scroll down and enable access for less secure apps. This is essential for IMAP, POP and SMTP connections. 

import.png Note: Even if you have checked this before, check it now because Gmail disables this access if it is not in use.
import.png If there is still a problem, try clearing Captcha: visit https://accounts.google.com/DisplayUnlockCaptcha and sign in with the Gmail username and password.

article.pngYou may also find the following articles helpful:

 If you have more questions on how to set up your custom email domain, feel free to contact the Affise Support Team via support@affise.com or your Dedicated Account Manager.

Written by Tatiana Mankevich

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