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Outlook: Problem in sending Mail – Receiving is Fine

Sometimes, when you open your Outlook email client app, you notice some new messages arrived in your inbox, but when it comes to sending a message you get an “error message”. This mainly occurs due to traveling and connecting through a different ISP from a normal one, because this ISP may block port settings. To resolve this Outlook error message, you can simply dial a toll-free Outlook customer support number and get instant assistance from the certified Outlook technicians in an effortless manner.

Some of the major reasons of this error message may vary, depending on the exact version of the email program you are using, but a few of them are:

  • Wrong Authentication Method
  • Mail Server (SMTP) is Offline
  • ISP Blocking Port 25
  • SMTP Authentication
  • Connection Security

To get instant support help for all these issues in your Outlook account, you can take Online Outlook Customer Support from a reliable technical support company and get quality assistance from the same.


Below are some of the useful steps to follow for Outlook, Thunderbird, etc. to fix this.


  • Simply go to Account Settings >Tools > Accounts.
  • Tap on the “Mail” tab.
  • Now tap on “Properties” and check that you are using GreenNet’s SMTP server. Outgoing mail (SMTP) should read “”
  • Confirm that there is a tick in “My server requires authentication”.
  • Lastly, tap on the advanced tab, under ‘Server Port Numbers’ change the Outgoing mail server port from 25 to 2525.

Save your changes and try sending email again. If, still, the issue persists, then contacting Outlook Technical Support Team is the right choice to opt for and get customized solutions adeptly.


  • For Outlook 2011 for Mac start your Outlook app.
  • Go to the Tools menu > select Accounts.
  • Select the GreenNet account.
  • After this go to “Outgoing server” which should be Under that, ensure “Override default port” and “Use SSL to connect” are both ticked. The box to the right of the “outgoing server” “:” should read “587”.
  • Then tap on “More Options.”
  • Tap “Authentication” and select “Use Incoming server info”
  • Tap “OK” and close the Accounts window.

For this, you can also take help from Microsoft Outlook Support phone number by dialing a toll-free number and get instant help from certified technicians to resolve the error message.

Port 25 blocking – Fixes

If your ISP is blocking port 25, then the preferred solution is to use the outgoing mail server provided by your ISP. You have various alternate solutions to this like changing the port to 26, 465 or 587 instead of 25; however, if your ISP begins to block these ports also in the future, then you will once again be unable to send an email. For this simply contact a third party support providing company and get customized solutions for resolving Outlook sending mail errors.

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