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3
votes
2answers
165 views

Migrating Email Providers; Are Multiple DKIM Records Viable During Transition?

I am currently gathering requirements for a small (hopefully) project of migrating from SendGrid to Mandrill as a transactional email service provider. We have been using SendGrid for close to 3-4 ...
2
votes
1answer
323 views

Exim not always sending AUTH LOGIN username/password

We are sending mail using exim (configured through WHM). With the same exact configuration, seemingly most of the time exim sends the correct AUTH LOGIN username and password, however sometimes it is ...
2
votes
2answers
542 views

Configuring white labeling between sendgrid and 1and1.com

I'm struggling to configure white labeling between sendgrid and 1and1.com. Sendgrid asks me to create a variety of subdomains on my domain registrar with specific CNAME values. I'm able to create ...
2
votes
2answers
149 views

Will adding an MX record for email forwarding conflict with an email provider like sendgrid

I'm planning on receiving email/forwarding email using postfix, but sending email using sendgrid. According to this tutorial, I need an MX record pointing to my machine - ...
0
votes
1answer
162 views

How does the DKIM from SendGrid prevent me from spoofing my email adress?

I'm making use of SendGrid to send automatic emails. First I went to the whole hassle of creating a DKIM record, before I recently discovered the whole record doesn't seem to be checked anyway, ...
0
votes
1answer
49 views

Sending bulk / single emails from a single domain [duplicate]

Let me explain our situation: We have a web application that uses subdomains for each customer instance: customer1.example.com customer2.example.com Every instance can have over 500 users, which ...
1
vote
1answer
598 views

Postfix: use relayhost only when direct delivery not specified

I read up on using relayhost with Postfix 2.6.6. It's possible to use different relay hosts, with different credentials, for different senders. But how do I use direct delivery with specific senders ...
0
votes
1answer
1k views

EXIM - 550 Cannot receive from specified address - Sendgrid

We're having some intermediate issues with exim where some emails go through and then others get the 550 Cannot receive from specified address Error. This is the guide we used to setup EXIM: ...
2
votes
1answer
1k views

postfix ignores relayhost

I have setup a sendgrid relayhost on my postfix server. This works perfectly when sending mails via sendmail: May 24 16:21:13 ip-*-*-*-* postfix/smtp[17742]: 542D01CDF: ...
1
vote
1answer
180 views

running localhost mta vs. php smtp'ing via 3rd party api

so the question is, would it be "better" to run localhost mta (ie. postfix) or "better" to use 3rd party restful api, embedded in the application, to send email? i am curious what people would do ...
0
votes
1answer
437 views

In Heroku's add-on of Sendgrid, how come I don't have to enter TXT fieldn in my DNS records?

When I used Amazon SES, I had to put TXT records in my DNS so that Yahoo/Gmail knows that the server is allowed to send from my domain name. However, when I signed up for Heroku and Sendgrid Add-on ...
2
votes
1answer
979 views

How to correctly add SPF record

I need to add a SendGrid SPF record for my GoDaddy domain, but I'm not sure exactly where to put it. I have an existing TXT record for @ with value of ...
1
vote
1answer
271 views

Using a local MTA as gateway to Sendgrid

I am setting up an email system using Interspire Email Marketer with 5 user accounts, and each user has their own Sendgrid account. We are trying to build a fast system, so we have a dedicated MySQL ...
1
vote
3answers
350 views

Does using a 'foreign' domain as email sender reduce email reputation?

We want to send emails through our webapp. Users of the app provide their email adresses. In some cases, we want to send transactional email from the webapp, using the current user as a sender. Does ...
1
vote
0answers
541 views

IIS 6 Smart Host Outbound Security

I'm using the IIS 6 smart host setting to forward all email sent through IIS to SendGrid. It works fine if I set the Outbound Security and smart host settings at the top level of the Default SMTP ...
-2
votes
3answers
261 views

Cloud service to receive up to 30000 emails a minute [closed]

I am building a business where I want the infrastructure to be able to handle up to 30000 emails per minute during peak periods. The question is what kinds of services offer this? I expect to download ...
1
vote
2answers
1k views

Configuring Postfix with other SMTP provider

I want to use SendGrid as my email sending service, but want to also use Postfix's internal queue mechanism to manage the emails sent through Sendgrid. So basically what I want to do is to configure ...
3
votes
2answers
2k views

Postfix not sending email after upgrading to Ubuntu 12.04

After upgrading a server from Ubuntu 10.04 to 12.04, postfix is no longer sending email through sendgrid.com. I followed this guide about 6 months ago and everything had been working perfectly until ...
0
votes
1answer
232 views

Sendgrid - non-virtual recipients

I need some help understanding the nature of this service with relation to incoming emails. We have adopted SendGrid for ensuring deliverability of our application's emails (automated stuff like ...
2
votes
1answer
2k views

OTRS - configure smtp to add a custom sendgrid header?

I'd like to be able to configure OTRS ticket system to send email through sendgrid but I also want to add some configuration parameters through the X-SMTPAPI sendgrid header. There's no obvious ...
0
votes
2answers
3k views

Prepend X-header to all relayed messages in Postfix

I've got several production servers running a LAMP stack. They each have a local Postfix server catching any mail from the system and from PHP, and relaying it via a smarthost (the SendGrid SMTP ...