The larger email service providers (Constant Contact, iContact, MailChimp) all offer some sort of autoresponder service.
Take the above situation and add on all of the various orgs who feel the need to push end - of - quarter fundraising, and you've got so much email concentrated in so little time that it's been known to slow down or crash the mail servers of some of
the larger Email Service Providers (ESPs).
Not exact matches
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While the internet's original design was all about decentralization — so the network would withstand losing nodes in a nuclear attack — in practice, most of today's
email traffic is concentrated in a handful of
large service providers like Google and Microsoft.