14,721 reputation
1928
bio website systemajik.com
location Gatineau, Canada
age 59
visits member for 4 years, 10 months
seen 14 hours ago
I have over 30 years experience in all phases of software development and delivery. I have administered a variety of midrange servers, and worked with systems from PCs to Mainframes.

1d
answered Emails never arrive at recipient but spam tests show no problems
1d
revised Why is email being delivered normally despite an SPF “hardfail”?
Add check on parent for server record SPF record and related notes.
Dec
19
comment Multiple MX records pointing to multiple servers for a single domain
@Collin Don't worry about the outbound as that will just work. The complexity is in getting the various MX servers knowing where the user accounts are. It might be simplify life to use a sub-domain for one server or the other. Then you can use alias, if supported, to route your users to the correct server.
Dec
17
answered Is Linux limiting my application's UDP transfers, and how can I see it?
Dec
15
comment SPF issue with SpamAssassin
@cjauvin Yes, that is an example using an authenticated submission with Postfix. The same configuration can be used directly from an application. Alternatively, you can configure your mail server to relay for your VPS box and use port 25.
Dec
14
comment SPF issue with SpamAssassin
@cjauvin Yes you would need ipv4:69.164.216.89 if you are sending directly. The preferred option would for the linode to relay via your MX which simplifies everything and doesn't need SPF changes. You linode server doesn't accept mail connections which will count against it on some servers. You mail server fails rDNS validation of the name you have in DNS. You may want to get the PTR record updated or use box5.domaineinternet.ca as your MX.
Dec
14
comment SPF issue with SpamAssassin
@cjauvin Your SPF record looks good. If you can change the policy to -all it would be better. However your mail server thinks it's name is box5.domaineinternet.ca. You should adjust its configuration so it answers as mail.roucet.com.
Dec
13
revised SPF issue with SpamAssassin
added 250 characters in body
Dec
13
answered SPF issue with SpamAssassin
Dec
12
comment Incoming Mail MS Exchange On Dynamic DNS
@NibbrWebDevelopment Normally, the header would be set by the client. In the case of a web application, the application would set the headers. I don't use Exchange, and I don't know its ability to modify headers. The Linux/UNIX mail servers can usually do this fairly easily.
Dec
12
comment Sending bulk / single emails from a single domain
@Basaa You are likely getting classified as spam because one or more of your senders is not using a proper opt-in strategy. Blacklists often use spam trap addresses to identify spammers, not the content of the messages. This capture sender who send unwanted email (SPAM). There are several sites which outline proper bulk emailing processes. Your high bounce rates indicate you are NOT following them.
Dec
12
comment Incoming Mail MS Exchange On Dynamic DNS
@NibbrWebDevelopment I've added a couple of likely solutions. Getting a paid Google account may also solve the issue. A fixed IP addresses and full email server is another option.
Dec
12
revised Incoming Mail MS Exchange On Dynamic DNS
Respond to comment.
Dec
12
revised High number connections coming from an IP
Further details
Dec
12
revised High number connections coming from an IP
Checked IP address.
Dec
12
answered Incoming Mail MS Exchange On Dynamic DNS
Dec
12
comment How is a TCP request routed from a virtual machine to an outside resource and back again?
@Obto In NAT the external connection is be between the VM container, not the VM itself. The relevant MAC address is the MAC belonging to the external interface of the VM container. The VM container will know the MAC of the VM and forward accordingly.
Dec
12
comment High number connections coming from an IP
@Andre STUN has TCP variants, including a TLS version. Those would have SYN packets.
Dec
11
answered How is a TCP request routed from a virtual machine to an outside resource and back again?
Dec
11
answered High number connections coming from an IP