Hello,
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I'm a relatively new Groups.io user who has been running an announcement-type list for a couple of months now, after abandoning Yahoogroups. Up until today it all ran smoothly.?
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Starting today I am not able to post announcements to my groups.io account from my Hotmail web account. The message bounces and I get an error message as pasted below. My Hotmail adress is the owner of said groups.io group.??In fact, I was not even able to join this Moderator Forum with my Hotmail email and had to join with my secondary Yahoo account.?
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I made no changes to my groups.io account or my membership. I checked a thread from last year that seemed to have this problem; "new subscriber cannot send message to group" by Bob B., where the solution was lacking or erraneous subject field. Someone else suggested the sender's email was not subscribed to the group or sent to the wrong groups.io adress. I double checked all of that and everything seems fine.
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Then I contacted Hotmail support which suggest that the domain groups.io needs to be whitelisted to communicate with Microsoft's domains. Whitelistig can be done here:
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https://support.microsoft.com/en-us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3&locale=en-us&ccsid=636094517133798255
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Alternatively, the error might be because the domain groups.io is not configured correctly, Microsoft/Hotmail support suggests. "One needs to check that with the domain supplier" they say. Contact the whitelist support here:?
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https://postmaster.live.com/snds/FAQ.aspx?
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On that page there is a link called "If I have more questions, whom should I ask?" to get in touch with Postmaster for Outlook.com.?
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More about whitelisting:
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Hotmail support furthermore suggested that someone from the organization/company that runs groups.io looks into this because it's a commercial field, not an end user field.
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Is this forum read by groups.io staff who might look into this or know something about the above?
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I was able to log into my groups.io web interface and post from there, so the announcement did go out eventually, but I prefer to post from Hotmail.?
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Thanks,
Glenn
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groups.io gave this error:
Remote server returned an error -> 500 Invalid request?
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Information for admins:
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Generating server: VI1EUR04HT036.mail.protection.outlook.com
groups.io
Remote Server returned '550 5.0.350 Remote server returned an error -> 500 Invalid request'
Source header:
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[long header trimmed by moderator] 
Shal Farley