From: mm@dorfdsl.de   
      
   On 06.09.2025 00:01 Uhr Lawrence D’Oliveiro wrote:   
      
   > So staff at my client send an email to this customer (actually a   
   > reply to a previous email from them) from their own domain, which has   
   > an SPF record. Mimecast receives the mail, does something or other to   
   > it (I have no idea what, and no interest in finding out), and tries   
   > to pass it on to outlook.com.   
   >    
   > outlook.com sees the sender address for that mail is at my client’s    
   > domain. Checking the corresponding SPF record, they see that nobody   
   > is authorized to send mail from that domain other than my client’s   
   > own machines (of course). So the mail forwarded from Mimecast gets   
   > rejected.   
   >    
   > Should my client (and myself) have to worry about internal mail   
   > screwups at other companies? Seems to me, if this lot want to use   
   > both mimecast.com and outlook.com, they need to have some way to tell   
   > their outlook.com service to accept any and all mail forwarded from   
   > mimecast.com.   
      
   That domain has a crap configuration. If they want to route their mail   
   from mimecast to outlook, they need to configure outlook.com to ignore   
   SPF fails.   
      
   --    
   kind regards   
   Marco   
      
   Send spam to 1757109701muell@stinkedores.dorfdsl.de   
      
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