Mithi SkyConnect is SPAM intolerant. Every mail incoming and outgoing is scanned by our clean mail service (SecureMailflow) and only clean mail are allowed in or out. Due to this the system never allows to relay spam and hence always maintains a very high reputation for its IP addresses.
We have very large customers hosted on this setup who routinely send mail shots to their mailing lists. To put it simply, a user can send his quota of allowed mail in a day, and as long as the mail are clean, there is less likelihood of that ID being blacklisted by the receiving systems as a spammer. For outbound mail, we configure best practice DNS records like SPF to ensure that the reputation of the domain is high.