I'm having problem sending alerts to external users. The site collection allows external users but when I type in the email adress like gmail it says that the organization do not allow it.

enter image description here

If it's not allowed what's the easiest method to send alerts to external users when they add, edit items in a list.

  • I have the same configuration than you and it works perfectly with hotmail, it must to be be a gmail account? – LR2007_ITA94 Sep 20 '16 at 13:54
  • It has to send alerts to all kind of domains. The company wants to send alerts to users personal email adr. I've also tried to send it to a hotmail adr but it seems that I need to "approve" that, but I don't know where I do that. I've searched inside the admin center .. – Plexus81 Sep 20 '16 at 13:59
  • @Plexus81 I think you should check your SMTP settings. Maybe your SMTP settings is restricting to send emails to external domains. – Rohit Waghela Sep 20 '16 at 15:09
  • @RohitWaghela are you able to send to ex gmail? – Plexus81 Sep 21 '16 at 8:48
  • @Plexus81 I have not implemented Email alerts for external domains. But You can refer this link i found while googling. May be this could help you out to resolve the issue-- blog.armgasys.com/?p=164 – Rohit Waghela Sep 21 '16 at 9:03


The theory is the following.

1) The invitation must be accepted first enter image description here

2) When the external user account has accepted the invitation, then it ill be displayed as #EXT#, in the O365 User administartion console enter image description here

3) It might by you need to configure the O365 SMTP relay. Only then one can add to the alerts list.

4) The challenge is pass the invitation at least with a O365 trial version. So far I did not find a way to pass the federation step.

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