Now SMS/MMS Gateway v5.0 http://www.nowsms.com

If the user account should be allowed to log into the SMTP interface to submit
messages using an e-mail client, check “Enable SMTP Login for this user”.
This allows a user account to login via SMTP with an e-mail client to submit
bulk delivery of SMS or MMS messages. The gateway uses the SMTP server from
its built-in MMSC to provide this functionality. Therefore the MMSC must be
configured and activated to enable this capability. When sending messages in
this fashion, the sender must configure an e-mail client to connect to the
gateway as an SMTP server, and to use SMTP authentication to login with the
defined user name and password. The gateway does not provide an e-mail
inbox, only outbound message sending via an SMTP interface. An authenticated
SMTP user can send an MMS message by addressing the message to
“phonenumber@mms.domain.name”, where “mms.domain.name” is the
“Domain Name for MMS E-Mail” defined on the MMSC configuration dialog. An
authenticated SMTP user can send an SMS message by addressing the message
to “phonenumber@sms.domain.name”, where “sms.domain.name” is the
“Domain Name for SMS E-Mail” defined on the MMS configuration dialog.
If message sending limits are enabled, check “Use Default Message Sending
Limits for this User” to use the default limits defined for the system, or
uncheck this setting to specify a maximum number of messages per day and per
month that are allowed to be sent by this account.
It is also possible to define a “Credit Balance” for each account. This balance
specifies a fixed number of messages that the account is allowed to send. Each
time the account sends a message to a recipient, a credit is deducted from this
balance. To add or remove credits, enter the number of credits in the
“Credits to add” field and press “Ok”. (Prefix the number with a minus
symbol, -, to remove credits from an account.)
If the account should only be allowed to connect from a limited set of IP
addresses, a comma delimited list of IP addresses from which the account is
allowed to login can be entered in the “Restrict to IP Address(es)” field.
Addresses can include a “*” character as a wildcard to allow connections from
all addresses within a subnet.
If all messages submitted by this account should have a particular sender
address associated with the message, this sender address can be automatically
applied to all messages submitted by the account by specifying a sender
address (usually a phone number, but sometimes alphanumeric values are
supported by SMSCs) in the “Forced Sender Address” field.
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