Any service runs into "occasional delivery problems". In those cases you have to explain support the issue and deal with the luck if they will be understanding

Any service runs into "occasional delivery problems". In those cases you have to explain support the issue and deal with the luck if they will be understanding or not. I'm sending few MM emails on daily basis (no, it's not spam) and hosting my email server on simple VM. Any service will cost me ten of thousands USD monthly while I am paying something under $100.