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First, it would help to note the difference
between a POP (Post Office Protocol) account and an SMTP (Simple Mail Transfer
Protocol) account. Although the ability to send and receive email comes with
most email accounts, receiving email is normally accomplished through a POP
(input) account, while sending email is an "SMTP" (output) feature.
Mailboxes and email aliases deal with the POP
(receiving) aspect of your email. A POP account is essentially a mailbox. As the
term mailbox implies, it's like a real-life mail box, a place to receive your
mail (a major difference being that email travels at the speed of light while
regular mail sometimes never sees the light of day.) Once in your mailbox, email
just sits there until you "retrieve" it. (Some services allow mailboxes to be
forwarded, but then you'd need another mailbox to receive the email in.)
This is where setting up your "email client"
(Outlook, Netscape email, Eudora, etc.) comes in. By setting up the mail-server,
ID and password parameters, you tell the program where to retrieve your email
from. Many email clients even give you the option to "leave email on server
after retrieval." This means that you can retrieve your email (with the "leave
email ..." option on) on your laptop, when you're away from home, for example,
then later, when you get home, retrieve the same email messages on your desktop
(where you might want to keep a more permanent record of your email).
Once you retrieve email with the "leave
email..." option off (perhaps on your desktop, in the above example), the same
email messages are no longer available for retrieval; they have been deleted
from the server.
Email aliases are a different animal. Let's say
you have a website mysite.com and you've set up a mailbox "mybox;" so your email
address is now mybox@mysite.com. Now you decide that your cousin, who works for
you, also needs an email address. So you set up an email ALIAS mycousin@mysite.com.
(If the only reason you hired him is to make your aunt in Wisconsin happy, you
might give him an email address like myauntscousin@mysite.com.)
This email alias, mycousin@mysite.com, MUST be
forwarded to a mailbox, or another alias which eventually goes to a mailbox.
This is because aliases do not have a "box" of their own for email to accumulate
in; they are simply forwarding tools.
As a result, if mycousin@mysite.com were
forwarded to mybox@mysite.com, when you retrieve your email for mybox@mysite.com
you will automatically also get the email for mycousin@mysite.com. Using this
approach, you can have many aliases forwarded to one mailbox.
Why, then, you might ask, would anyone ever
need more than one mailbox? Good question. (Why didn't I think of that?)
One reason might be, let's say your aunt from
Wisconsin comes to work for you and you want to give her the email address
myaunt@mysite.com. (If the only reason you're hiring her is because your cousin
can't live without her, you might want to give her the email address whatapain@mysite.com.)
If you make her email address an alias (as opposed to a mailbox), then every
time you retrieve your email from mybox@mysite.com, you'll also get her email,
which was sent to myaunt@mysite.com. What's worse, if you give her access to the
mailbox so she can retrieve her own email, she'll also see your email.
Technically, there's nothing wrong with this. But from a family relations
standpoint, this may lead to "technical difficulties" of another kind.
So, you make myaunt@mysite.com a mailbox, not
an alias. (The menu options for setting up aliases and mailboxes can vary from
one service to another, so I won't get into that.) Now she can retrieve her
email directly from myaunt@mysite.com and you can still retrieve your email from
mybox@mysite.com, and neither one of you would see nor interfere with the other
one's email. This would probably be the best solution; because the last thing
you want is to find out that your aunt is not really your aunt, your cousin is
not really your cousin, and that you were adopted, and you're not even you. This
can't be good for business.
Email accounts given to you by an ISP (like
Earthlink, Verizon, etc.) are usually much simpler in construction and less
flexible. In a simple setup, you might get one mailbox with several aliases that
automatically get forwarded to the mailbox. If this is good enough for you,
there's no need to mess with your website's email features. One serious downside
to this is if you change ISPs, you'll have to give people your new email
addresses. While if you use domain-based email addresses and then change your
web hosting company, presumably your domain name will go with you and your old
email addresses will remain valid.
The only question remaining now is, if you
change your ISP, you change your hosting company, and you change your business
location, do your aunt and cousin come with you? Even tech support can't answer
this question.
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