Firewall: only allow specific application server IPs
The article discusses the configuration of a firewall to allow only specific application server IPs for SMTP relay servers. It outlines the differences between self-hosted and cloud SMTP relay options, including their costs and compliance controls. Additionally, it provides technical details on setting up a secure SMTP relay using KumoMTA.
- ▪An SMTP relay server is designed for outbound email delivery optimization.
- ▪Self-hosted SMTP relays offer full control and compliance, while cloud options are easier to set up.
- ▪The article includes technical configurations for KumoMTA to ensure secure email delivery.
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Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/dhiraj_chatpar_e54b46b388/firewall-only-allow-specific-application-server-ips-3lfn |
| Publication time | Mon, 18 May 2026 16:59:15 +0000 |
| Retrieval time | 2026-05-18T17:04:56.667Z |
| Last seen | 2026-05-18T17:04:56.667Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | eb4Yf0oa8J5J |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3742392) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Dhiraj Chatpar Posted on May 18 Firewall: only allow specific application server IPs #email #smtp #mta What Is an SMTP Relay Server? An SMTP relay accepts outbound email from your applications and delivers it to the final destination mail servers (Gmail, Outlook, Yahoo, etc.). Unlike a local MTA that handles both inbound and outbound, a relay focuses purely on outbound delivery optimization.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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