telkomsa.net email box with outgoing mweb server. how do i get authenticated to send to gmail addresses? even changing to telkom sever setting - outlook cant save settings or get connected

Question

Hi my email worked fine with outlook till mid June 2026. all of sudden i cannot communicatye to any person with gmail address. getting authentication error

............host gmail-smtp-in.l.google.com[Google mail-server IP removed] said:

    550-5.7.26 Your email has been blocked because the sender is

    unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with

    either SPF or DKIM. 550-5.7.26  550-5.7.26  Authentication results:

    550-5.7.26  DKIM = did not pass 550-5.7.26  SPF [telkomsa.net] with ip:

    [Sending server IP removed] = did not pass 550-5.7.26  550-5.7.26  For instructions on

    setting up authentication, go to 550 5.7.26

    https://support.google.com/mail/answer/81126#authentication

    [Delivery identifier removed] - gsmtp (in reply to end of DATA command)

telkom said if webmail is working then this is outlook problem and i need to get IT in outlook to fix! even with mweb that is my host i still cannot sent to any gmail addresses. mweb said its google with safety measures y have to use same host? please how many people in this world is using different host. i have this address for 25+ yrs and cant just give it up to use mweb. its not guaranteed going to stay forever with them then i have to changed again. i have used this email address for my business. how can this just stop working?

Answer 1

Hi Magda Oosthuizen,

I understand that the telkomsa.net address worked for many years, but messages to Gmail are now being rejected even though the mailbox remains accessible.

Please note that this is a user-to-user forum, so contributors cannot change Telkom or Mweb mail-server authentication records.

The 550-5.7.26 response shows that Gmail cannot authenticate the message: DKIM did not pass, and the Mweb sending IP is not authorized by the SPF record for telkomsa.net. This is not something that can be corrected within Outlook because SPF and DKIM are configured by the email-domain or outgoing-mail provider.

Please contact Telkom’s email support and provide the complete rejection notice. Ask Telkom to confirm:

1. The correct authenticated SMTP server for a telkomsa.net mailbox.
2. The required SMTP port, encryption type, username format, and whether outgoing-server authentication is required.
3. Whether the Mweb outgoing server is authorized to send as telkomsa.net, and whether Telkom needs to correct the domain’s SPF or DKIM configuration.

If Telkom confirms the settings, they can be checked in classic Outlook through Control Panel > Mail > Email Accounts > select the account > Change > More Settings. Microsoft’s instructions are available here: Change or update email account settings in Outlook for Windows.

If messages sent directly from Telkom webmail reach Gmail successfully, that further indicates the problem is with the outgoing-server route used in Outlook rather than with the Outlook application itself.

I hope Telkom can confirm the correct authenticated outgoing server so you can continue using your existing address.

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