Nopcommerce 3.70 gmail suddenly not working!

Okay so I have been using a custom gmail account with my domain and up until now everything was working ok. After the update from 3.6 to 3.7 I get the error 5.5.1 and Failure Sending Mail.

Settings that I have tried are as follows:

Email address: [email protected]
Email Display Name: MyStore
Host: smtp.gmail.com
Port: 587
User: [email protected]
Password: xxxxxxxxxx
SSL: CHECKED
Use Default Credentials: NOT CHECKED

This gives me a 5.5.1 error!

The second configuration that I've tried is:

Email address: [email protected]
Email Display Name: MyStore
Host: smtp.gmail.com
Port: 465
User: [email protected]
Password: xxxxxxxxxx
SSL: CHECKED
Use Default Credentials: NOT CHECKED

This gives a "Failure Sending Mail"


I have also used different ports, gmail and hotmail accounts but without any luck!
My "Less Secured Apps" for gmail are being controlled by GoDaddy but i do not see any problem with that since it was working up until the update.

Thanks in Advance

By the way, forgot to paste the "5.5.1" Error:

Short Message: Short message:  Error sending e-mail. The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

Full Message: System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, MailAddress from, Boolean allowUnicode) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at Nop.Services.Messages.EmailSender.SendEmail(EmailAccount emailAccount, String subject, String body, String fromAddress, String fromName, String toAddress, String toName, String replyTo, String replyToName, IEnumerable`1 bcc, IEnumerable`1 cc, String attachmentFilePath, String attachmentFileName, Int32 attachedDownloadId) at Nop.Services.Messages.QueuedMessagesSendTask.Execute()

Got it to work with SendGrid and Azure

Same Problem

See if any of this helps
https://www.nopcommerce.com/boards/t/23569/solved-551-authentication-required-with-smtpgmailcom.aspx

Is very easy.

Configuration -> Email Account
Go to google and generate the app password for set the last one option and Type NopCommerce, google'll generate a password for you, copy that and paste in nopcommerce password text.