What do you mean by "come across"? Are the emails not being delivered at all? If that's the case, there's likely an email server issue on your side of things.
If you mean the overall formatting of the email looks weird, that is an HTML/coding issue that a skilled developer could easily fix.
Long story short: Device should have no impact on emails getting delivered or displayed as expected!
Sorry for the confusion - I was referring to display, we've had no problems with delivery.
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Still won't have to do with hardware per se, except w/r/t screen resolution. Primary variables will be browser + webmail app/mail client app, software version, and (to a limited degree) OS version.
But this shouldn't stop you from buying standard modern hardware. You don't want to mask problems that the true (external) recipients of your emails may be experiencing. Same reason I don't believe in whitelisting Marketo IPs, because it gives you false assurance about deliverability.