There aren’t many guarantees out there in the IT world, but I’ve found that without fail, web designers will ALWAYS manage to screw up MX records when doing work in a web domain’s DNS settings.
Last week for instance, I was told a client was getting a new website. I immediately warned them about the track record many web designers have when doing things like this. The client immediately emailed the web designer, in Australia, about being careful. The reply was as follows:
[Client XYZ] email records won’t be altered as we’re only interested in the web hosting information
Suffice to say, less than five hours later I saw this when doing an MX lookup to see if this web designer was any different than the others: