A partner provides their own mail server. Most emails get sent using the server they provide (SMTP), the client that connects could be from many different IPs. Some emails get sent directly from our own mail servers (only voicemail notifications) if they need to allow IP ranges:
149.91.14.0/24, 154.51.137.96/27, 78.40.245.160/27.SPF
We have a record they can add to their SPF too
spf.sipcentric.comIf you currently have:
v=spf1 a include:autotask.net include:sendgrid.net include:spf.protection.outlook.com -all
Would become:
v=spf1 a include:autotask.net include:sendgrid.net include:spf.protection.outlook.com include:spf.sipcentric.com -all
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