Dear All,

I have setup Otobo Docker Installation Version:10.1.1 with the help of:

https://computingforgeeks.com/how-to-install-otrs-ticketing-system-on-ubuntu/

where I am unable to send emails via Postfix GMAIL SMTP Relay though Otobo SMTPS though I can send emails through Ubuntu CLI. Fetch mail and Fetch MailSSL are disabled. I can receive the emails on Postmaster account and users are able to raise ticket by themselves as well. Users are not getting forgot password emails and the password email during signup. Below-mentioned is the error log which I can see in communication logs.

Communication Log Details (5)

Kernel::System::Email
Building message for delivery.

Kernel::System::Email
Queuing message for delivery.

Kernel::System::MailQueue
Serializing and saving message (ArticleID: , Sender: myuser@gmail.com, Recipient: root@localhost, MessageID: )

Kernel::System::MailQueue
Successfully stored message for sending.

Kernel::System::Email
Successfully queued message for delivery (To: ‚root@localhost‘, From: ‚myuser@gmail.com‘, Subject: ‚OTOBO Scheduler Daemon Cron: MailQueueSend‘).

The problem is with the SMTP process only.

AdminEmail: info@mycompany.org
CheckEmailAddresses: Enabled
CheckEmailInvalidAddress: @(example)\.(..|…)$
CheckEmailValidAddress: ^(root@localhost|admin@localhost|otobo@localhost)$
CheckMXRecord: Enabled
CheckMXRecord::Nameserver: 8.8.8.8
Fetchmail::Bin: Disabled
NotificationSenderEmail: myuser@gmail.com
NotificationSenderName: Support
Sendmail::DefaultHeaders: Enabled
SendmailBcc: Disabled
SendmailEncodingForce: base64
SendmailEnvelopeFrom: Disabled
SendmailModule: Kernel::System::Email::SMTPS
SendmailModule::AuthPassword: Gmail APP Password
SendmailModule::AuthUser: myuser@gmail.com
SendmailModule::CMD: /usr/sbin/sendmail -i -f
SendmailModule::Host: smtp.gmail.com
SendmailModule::Port: 465
SendmailNotificationEnvelopeFrom: Disabled
SendmailNotificationEnvelopeFrom::FallbackToEmailFrom: Disabled

Please suggest

Regards,
Abhishek