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Currently I have a dynamic IP address from my ISP. I am using an in-house mail server and have set it to relay thru the ISP when sending, so it appears to be coming from the ISP instead of the dynamic IP address. Also, since it's a dynamic IP address, the host record gets updated with the registrar automatically every 5 minutes. Is this setup ok to depend on as far as sending and receiving mails? I want to make sure mail is actually getting to their destination and not even ending up in their junk box. I'm trying to weigh if it's really worth it to go for the static IP plan.
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Currently I have a dynamic IP address from my ISP. I am using an in-house mail server and have set it to relay thru the ISP when sending, so it appears to be coming from the ISP instead of the dynamic IP address. Also, since it's a dynamic IP address, the host record gets updated with the registrar automatically every 5 minutes. Is this setup ok to depend on as far as sending and receiving mails? I want to make sure mail is actually getting to their destination and not even ending up in their junk box. I'm trying to weigh if it's really worth it to go for the static IP plan.

Safe to have dynamic IP, mail server, and ISP relay?

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).

Broadband

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.