TerraMaster Forum

After upgrading from TOS 6 to TOS 7, email notifications using the local SMTP server no longer work. Could you please check why this is happening and how it can be resolved?

Thank you in advance.

Soundds like an old iteration of this issue has returned. Frankly I think you would be better off using the 'Custom' feature and entering the details for your usual email service. That seems to be more direct than a nebulous 'local' server.

Hi.
By default, the "Local" SMTP option in TOS relies on TerraMaster's internal SMTP service. However, Email sending might not work because of limits set by your local ISP or network environment — for example, security rules, version mismatches, or similar issues. We recommend retrying after a brief interval.
Also, make sure your network is working, particularly DNS resolution.
If you need more dependable email delivery, you might want to set up a custom SMTP service like Gmail or 163 instead.

Hi TMzethar,

Unfortunately, the local SMTP service is still not working on TOS 7. I have tested it several times and consistently receive the same error reported in the previous screenshot.

DNS resolution is working correctly, so this does not appear to be a DNS-related issue. I experienced the same problem on TOS 6 in the past, but it was eventually resolved.

Could you please confirm whether the local SMTP server is currently supported and fully functional in TOS 7? If so, please provide a specific troubleshooting procedure or indicate whether this is a known issue requiring a fix.

An external SMTP server is not a viable option for my environment, so I need the local SMTP service to work reliably.

Thank you for your support.

Best regards,
Enrico

I have just finished verifying the SMTP service on TOS version 7.0.791, and the email notification function of the local SMTP server works properly. Could you please provide the TOS version number of your device and check its network-related configurations?

Hi TMjack,

I am running TOS version 7.0.0791.
Could you please clarify what you mean by “its network-related configurations”? DNS resolution is working correctly, and TOS has Internet connectivity.
From my perspective, the issue was introduced during the upgrade from TOS 6 to TOS 7, as the local SMTP service was working correctly before the upgrade.
I can provide logs or any other diagnostic information you may need. Please let me know exactly which logs, commands, or configuration details you would like me to collect.

Best regards,

Enrico

sempiter wrote: ↑26 Jul 2026, 16:23

We have verified under TOS6 and TOS7 without problem, you may try with other email address

Hi MikeZhang,

I am referring to the “TM Support” label shown on your forum profile, which is why I expected a more concrete and helpful support response.

I have already tested multiple email addresses with different domains and the error remains exactly the same.

On a forum section labeled “TOS issue report,” I would expect support staff to investigate the issue and help identify the cause, not simply state that it works in their environment and suggest trying another address.

The problem appeared after upgrading from TOS 6 to TOS 7. DNS resolution is working correctly, TOS has Internet access, and the issue persists across different recipient addresses.

If this issue is not being handled by the appropriate support team here, could you please indicate where I should direct it within the forum or support channels?

If you need logs or any other diagnostic information, please specify exactly what you would like me to provide.

Best regards,
Enrico

sempiter wrote: ↑27 Jul 2026, 02:03

Who provides your incoming email service. There have been issues, for example, with Gmail in the past identifying (and requiring) special setup for what Gmail perceives as "mail from machines". Likewise possible geo-location issues with service providers - do you perhaps use a vpn? There are probably numerous reasons why email might fail - up to and including the recipient mailbox being full. (Had to explain that to my technophobe sister just this evening).

The default local SMTP setup is the same in both TOS 6 and TOS 7, and it's working fine for many users globally. Regarding the difference you're noticing between the two versions — we honestly can't say for sure what's causing it. It could be a coincidence.