Distribution List is returned as undeliverable - Microsoft Community

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i send e-mails needed (no set time, date, etc.) personal distribution list of folks have asked on list.  had no problems until month ago when e-mails sent distribution list marked undeliverable.  broke list 4 lists , went through , became undeliverable.

i add or delete name otherwise list stable.

i use outlook app

i have redone original list and, i've stated above, tried sending out shorter lists , returned.

below examples of "error" messages return.  first example kept getting , second.  i've looked on website , saw can have on 100 e-mails on distribution list no problem.  

"undeliverable:"   "

the following recipient(s) cannot reached:

 

      'e-mail address' on 10/18/2017 10:27 am

            server error: '501 syntax error in arguments'

later "undeliverable"  

now latest!

the following recipient(s) cannot reached:

 

     'email address' on 10/27/2017 3:36 pm

            554 transaction failed :  cannot send message due possible abuse; please visit http://postmaster.yahoo.com/abuse_smtp.html more information

 

"i send them bcc because don't want people spammed , protect privacy!

anything bcc myself comes inbox marked ***spam*** in subject line

what wrong after time?  thank assistance.

if word 'spam' added subject line done anti-virus or anti-spam software

what av using under win version?



Office / Outlook / Other/unknown / Office 2007



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