1
vote
1answer
59 views

Should DNS A timeout to result in permanent email failure?

Occasionally an email does not get through when sent to a recipient who uses the outlook.com system for their email server. Their MX record resolves fine, but their A record (something like ...
0
votes
1answer
33 views

Finding valid email service providers in a large list of domains

I have a list of approximately 13K free email/webmail providers from circa 2000. Obviously the vast majority of these services have gone out of business, and the domains have either lapsed, or been ...
0
votes
2answers
35 views

SPF with a Mail Gateway: do I need to put all my mail servers?

I always put all my Mail Servers in SPF declarations, but I'm not sure if this is the correct way to implement SPF. All my mail got routed through a Mail Gateway. Everything goes first to this server ...
0
votes
2answers
69 views

Reverse DNS (PTR) for Email

We are hosting our website (http://www.redappleapartments.com) with a hosting company in Sweden. And we are using godaddy as our email provider. So, our smtp servers are smtp.europe.secureserver.net ...
1
vote
0answers
32 views

Some emails don't arrive

Yesterday, somehow a DNS Zone File got removed from Cloudflare. So after re-editing the file everything seemed okay. Now there's the problem that some emails don't arrive in the inbox. Strange thing ...
3
votes
1answer
201 views

A record required for MX record?

Previously our domain, let's call it ourdomain.com, pointed to an IP address (our web host). In addition, we use Office 365 to handle our domain email accounts. DNS records: ourdomain.com A ...
0
votes
1answer
167 views

DNS Zone Record: How to set up MX Record correctly? [closed]

I've been search for this for quite a while, and tried many different examples for weeks (because I usually have to wait a couple hours for the DNS change). Nothing made my mail() in PHP as well as my ...
0
votes
3answers
76 views

Move mail server to a new server with no downtime

We have a server that currently acts as a web, database and mail server. We would like to move mail to its own dedicated server. So: The address for the mail server is mail.example.com. It has A ...
0
votes
1answer
158 views

Is it possible to receive inbound emails using Mandrill?

I am using Mandrill mail server for sending emails to users and I have my own domain added to Mandrill to send out mails. Suppose I have configured Mandrill to use info@mydomain.com to send out emails ...
1
vote
2answers
172 views

Setting up SPF records on dedicated server

I have a question in regards to SPF records in a dedicated hosting environment. I wish to set up an SPF record for my dedicated server, but I am not sure whether my understanding is correct. First ...
0
votes
1answer
371 views

Postfix/smtpd: Client host rejected: cannot find your hostname

I'm trying to set-up a mail server, using postfix and dovecot. Everything works fine, and I can connect in IMAP using Mozilla Thunderbird. But when I'm trying to send emails using the smtp server, I ...
0
votes
1answer
79 views

Do reverse entries for name-server, need to match the mailserver name?

I need to setup PTR for a domain and lets say my domain is domain.com and I have my email addresses like email.address@domain.com. I came over this mailing-list article that says: The reverse ...
0
votes
1answer
51 views

Setting MX entries for Failover [closed]

I have a GoDaddy domain as "example.com". I wanted to have my own DNS server for the sub domain secure.example.com. So I added a "A" record "NS" pointing to my IP and a NS record "Secure" pointed to ...
0
votes
1answer
83 views

“host lookup did not complete” error

I need to send mail from sub.domain.com but delivery to one address fails with an error "R=lookuphost defer (-1): host lookup did not complete". Additional information that might be relevant: My ...
1
vote
2answers
144 views

501 HELO no reverse dns name

I have a dedicated server with a public ip running postfix with multiple domains. The emails are coming in all right but when I try to send mails from this machine they often get bounced back by ...
0
votes
1answer
28 views

Setting Up PTR to correct “Forged hostname” error

Our e-mails mostly get through fine, but here's an error I haven't seen before. Diagnostic-Code: smtp;550 5.7.1 ... Forged hostname for 66.132.221.45 >which resolves as www.medialabinc.net but ...
-2
votes
2answers
68 views

How to properly set TXT SPF record when separating A from MX records [duplicate]

I have current TXT record for my domain: v=spf1 a mx ip4:{ip-of-my-server} -all Both email traffic and website goes to same machine. Now, I have to point website (A record) to other server. Will ...
0
votes
2answers
142 views

Using a CNAME to forward traffic from a naked domain

I have a domain, flyh2.com. I use a CName to forward www.flyh2.com to flyh2.elasticbeanstalk.com where my web site is hosted. This is the only way Amazon allows custom domain names. A records aren't ...
0
votes
2answers
49 views

Do I need an MX record for my main domain?

Let's say I have several domains. bossguy.com is the domain that hosts my mail (IMAP server) and where I ssh in to manage other domains, for example: domain1.com domain2.com domain3.com It makes ...
2
votes
1answer
53 views

SMTP routing cases: same @domain as sender and different @domain

I would like to know what is the difference between sending an email to the same @domain as the sender and sending to a different domain. I cant really find a detailed explanation on the web. From ...
-1
votes
1answer
44 views

TTL on DNS for domains as a security measure [closed]

Ever since I read this article the other day, I've felt a bit uncomfortable about my domains being stolen. And I've tried taking each measure possible. But one I don't understand completely is TTL. ...
1
vote
3answers
94 views

How is DNS resolved for email addresses?

If I send an e-mail to gus@example.com, how does my e-mail client find out what IP address to send the e-mail to? I understand it would do a DNS lookup for example.com, but I want to know what ...
0
votes
2answers
40 views

Confusion about rDNS

I am slightly confused as to what has to go in the rDNS settings of my IP. Consider the following scenario: IP: 1.2.3.4 Domain 1: foo1.bar @ A 1.2.3.4 @ MX mail.foo1.bar www CNAME ...
0
votes
1answer
34 views

Preventing or Limiting Spammers/Bad Guys from Using My Domain

I started getting replies in my catch all email box that spam and viruses has been sent from my domain. Someone is spoofing my email addresses to send out spam and malware. I was wondering if anything ...
0
votes
1answer
65 views

Setting up server for Google Apps? [closed]

So I am currently running CentOS 6 and trying to figure out how to get Google Apps (gmail) to work. I am completely new to mail server software but have a general idea of how it works. What software ...
5
votes
1answer
560 views

Is it OK to have multiple TXT records for a single domain containing different SPF entries?

A remote recipient domain is rejecting mail on the grounds of SPF and I think it's because the sender has SPF configured incorrectly. When I run dig, I see: [fooadm@box ~]# dig @8.8.8.8 -t TXT ...
1
vote
2answers
415 views

Failover for server with dual WAN

I have one mail server, one SonicWall firewall, two Internet providers, and an internal DNS server. I have WAN failover set up on the SonicWall so in the event that the primary connection is down ...
1
vote
2answers
56 views

Assist in diagnosing reverse dns mismatch

We seem to have an occasional issue, whereby mail is bypassing our first three MX records, and going to our 4th MX record. This is purely a backup, and we think that the reason it is skipping the ...
0
votes
1answer
334 views

issue involving ptr record when sending email on digital ocean server

The Issue We have a website that sends email using php mail function and sendmail. We frequently get email rejected response emails from several destination email servers saying that we have an issue ...
1
vote
1answer
74 views

How to safely move mailbox to another server?

I have a hosting for my client on a shared server (website, domain and mailboxes) and I want to change the provider and move everything to another server. Moving the website is as easy as copying the ...
2
votes
1answer
94 views

SPF record validation - best guess only

I administrate the domain [mydomain.com] which was until now only used for handling mail through Google Mail/Google Apps. Now I added a server which should be part of the domain without changing the ...
2
votes
1answer
231 views

Using “mx ptr” parameters in DNS SPF record

I'm trying to set up my SPF record to validate properly both for emails sent through Google Apps and for those sent from MailChimp's servers. MailChimp's docs recommend this SPF record: v=spf1 mx ptr ...
0
votes
1answer
102 views

What will be the SPF entry in DNS?

We are using magento on our server. Magento sent transactional emails directly from our server using php mail function, along with this we are using third party webmail service. Means our mx entry ...
0
votes
0answers
315 views

Setting up Outlook.com with own domain (godaddy)

I've been trying to setup a mail service with my own domain. I followed this tutorial , set up the MX records on GoDaddy and still got problems. Basically I can send the email from my own domain but I ...
0
votes
1answer
17 views

redirect emails from one domain to another

i have 2 domains. domain.com and domain.org all my emails are at domain.org so i have user1@domain.org user2@domain.org etc... i want that if some have a mistake and he sends email to ...
0
votes
2answers
996 views

Combining multiple SPF records - SenderID - kind of lost

Tried to read up on SPF record creating but I am a bit lost. I need to combine and create an SPF record because our email is not getting through. Here are the ways we send email: Daily ...
0
votes
0answers
98 views

SMTP fails with Status: 5.3.5 when sending to a local mail server

In our network, we have na IBM Lotus Notes server, which handles emails for basedomain.com. Recently we introduced a new IIS Smtp server just for sending automated emails. The Smtp is configured for ...
0
votes
1answer
146 views

Some E-mails are being rejected, do I need a DNS record for my default gateway?

I have been seeing more of these types of bounceback messages (IP address changed for example): mail.test.com #550-Your message was rejected by this user and was not delivered. 550-Reason: Your ...
0
votes
3answers
69 views

How to change domain's A record without disabling incoming mail traffic for a while?

I have situation where my domain's A record is pointed to certain IP address, which I need to change, but MX record have destination - to my domain name! How to change A record and to avoid mail ...
0
votes
1answer
167 views

Server Move - MX Record pointed wrongly

I am trying to move a site from host A to host B and email is hosted in host C and we would like to retain the same. I have set the same MX record for both A and B, however when I run a test at ...
2
votes
1answer
110 views

Are these nameservers configured properly?

I'm caught in a technical war between two companies. One is a major email hosting organization. The second is a DNS provider called DNSMadeEasy. The problem: An email from an outside domain to a ...
0
votes
1answer
44 views

Receive email on heroku app

Is it possible to receive domain email at Heroku, and have you domain pointed to the correct place? For example, I want to receive email at addesses@mydomain.com, and I also want to have my DNS ...
-1
votes
2answers
72 views

Adding MX records to DNS

Let's say I have a Computer A which is running postfix, Computer B is running tinydns. On domain project.domain.com I'm running httpd server and on the other server with DNS (tinydns) have entries ...
0
votes
2answers
270 views

How to set up hosting on Heroku and email forwarders on a WHM (cPanel)?

I'm using DNSimple for managing my records, hosting my site at Heroku and I want to use a Linux WHM (cPanel) for managing emails forwarding. Hosting works, but I'm having a hard time getting emails ...
0
votes
1answer
50 views

DNS Puzzle - No MX records but still routes email

We have a client that the domain name has a cluster of DNS servers serving it but when it comes to mail routing... I've checked several different mx lookups including nslookup and things like who.is ...
0
votes
1answer
194 views

Dkim DNS Setup: dig +trace finds the key, dig notrace doesn't

i'm setting up DKIM for my domain to sign outgoing mails. I've got some issues on DNS configuration, because DNS configuration is mixed between external DNS (hosting) and a cloud server, which sends ...
0
votes
1answer
109 views

How does domain name resolution work for SMTP relay services?

Having problems with the default e-mail provided by a shared host (blacklisting and quotas), so I'm looking into SMTP services to handle outbound mail instead. However, one thing that I haven't been ...
0
votes
1answer
62 views

Multi MX records with nonidentical e-mails

I have two domains, one forwarded to the other. I want to use 2 e-mail accounts on both domains as aliased but some e-mails only on the other domain. I will create 2 MX records for both domains with ...
1
vote
1answer
1k views

Cloudflare, reverse DNS and php mail ending up in spam folder

I've been using Cloudflare to host my DNS, and PHPMailer to send e-mail through ZOHOs SMTP servers with great success, but have found that all my e-mails are hitting Gmail, Zoho and Hotmails spam ...
-3
votes
1answer
27 views

After including DNS forwarder, not possibility to send email to the “forwarded domain”

I have a client non trusted domain, let say "domainA.com", I manage it with System Center 2012 installed in my company internal domain (let say domainB.lan). I have added forwarders in my dns to be ...