Real situation you find yourself in
You send the customer from 1C the act of completed works and the invoice. You write a letter directly in the program, click "Attach file," select the PDF of the act, and add the electronic invoice (ESF). The letter is sent. And a day later, the customer calls: "The file won't open" or "You sent an empty letter without attachments." You check to see what exactly was sent — and find yourself in the list of attached files of the outgoing letter. This object stores what was physically attached to your letter.
In other words, you open it not to "process the document," but to understand which files were actually sent to the recipient and why.
1. Purpose
Document.OutgoingElectronicMailAttachedFiles — a service object of the built-in mail of 1C. It stores attachments of a specific outgoing electronic letter: file name, type, size, indicator of an image in the body of the letter. It has no independent accounting meaning — it is always "attached" to the letter.
2. Where to find
You almost never go to it directly through the menu — you work with the letter itself, and open the files inside it:
- Section "Main" (or "Sales"/"Purchases") → "Mail" / panel "Current Affairs" → outgoing letter → area "Attached Files" (buttons "Attach," "Open," "Save").
- From any document: button "EDO" / "Send" → by email — the files you add in the sending form are placed in this object.
You can open the service list of the object directly (for incident analysis, cleaning, checking) through the navigation link. Copy it, then in 1C: "Service"/menu → "Go to navigation link" and paste:
e1cib/list/Document.OutgoingElectronicMailAttachedFiles
Tip: keep this link handy — through the list, it's convenient to find "heavy" letters with gigantic attachments that accumulate in the database.
2a. How to know your release
"Help" → "About the program" (or the ℹ️ icon in the upper right corner). There are two lines you need:
- platform version (for example, 8.3.24.xxxx);
- configuration release "Accounting for Kazakhstan," edition 3.0 — here it should be 3.0.74.2 or newer.
If the release is lower — the interface of the built-in mail and the send buttons may differ from the described.
3. How to fill in — by fields
You do not fill in this object "manually" like an invoice. The fields are filled when you attach a file to the letter. But it's useful to understand what each stands for — this affects whether the attachment will reach the recipient.
| Field | Purpose and what happens in case of an error |
|---|---|
| File name (mandatory) | What the recipient will see. If left empty or given a name with prohibited characters (\ / : * ?), the mail server may truncate the name or reject the attachment. Write meaningfully: Act_№125_LLP-Romashka.pdf. |
| File extension / type (mandatory) | Determines how the file will open for the recipient. If the extension is lost (file Act without .pdf), the recipient will see "unknown format." |
| File data (value storage) | The actual body of the file. This is the "heaviest" field — it is what bloats the database. An empty storage = the attachment will be sent with zero size. |
| Indicator "Show image" | Set for images that should be displayed directly in the body of the HTML letter (logo, facsimile), not as a separate attachment. Incorrect indicator → the image is either not visible or duplicated as an attachment. |
| Image identifier in text | Technical CID for embedded images. Changing it manually risks "breaking" the display of the signature/logo. |
| Link to the owner letter (mandatory) | Connection with the outgoing letter. Without it, the file "hangs in the air" and will not be sent. |
| Size | Control value. Guideline: the total attachments of one letter should reasonably be kept to 10–20 MB — many mail servers cut off larger. |
The mandatory minimum for a working attachment: a non-empty name, correct extension, filled file data, and linkage to the letter.
4. Analyzed example
Situation: on 07.09.2026, you closed services for LLP "Romashka" for 1,160,000 ₸ (including VAT 16% — 160,000 ₸) and send a package of documents to the client's email.
Steps:
- From the sales document, click "EDO → Send by email".
- The printed form "Act of completed works.pdf" (size 180 KB) is automatically pulled into the letter. This is the first line of attached files.
- You manually add the invoice
ESF_AA-125.pdfexported from the IS ESF (95 KB) — the second line. - The letter's signature contains the logo
logo.png(12 KB) with the indicator "show image in body" — the third line (attachment, but embedded).
Summary for the object (what will actually be sent to the recipient):
| № | File name | Type | Size | In the body of the letter |
|---|---|---|---|---|
| 1 | Act_№125_Romashka.pdf | 180 KB | no | |
| 2 | ESF_AA-125.pdf | 95 KB | no | |
| 3 | logo.png | png | 12 KB | yes |
There is no accounting entry for this example. And that's correct. The accounting result of the transaction (revenue and VAT) is formed by the sales document, not the letter:
- Dr 1210 Cr 6010 — 1,000,000 ₸ (revenue excluding VAT);
- Dr 1210 Cr 3130 — 160,000 ₸ (VAT 16% payable);
- Dr 7010 Cr 1330 — cost of goods sold (if goods were sold).
And the attached files of the letter merely delivered these documents to the client. No movements in accounting registers.
5. Types of operations
The object has no "types of operations" in the accounting sense. Practically, files can have three roles:
- Regular attachment — act, invoice, contract in PDF/Excel/Word.
- Embedded image (indicator "show in body") — logo, facsimile of signature, banner in HTML letter.
- File from the attached files of the source object — when you send not a printed form, but a previously saved file of a document/counterparty in 1C.
6. What is formed when sending
Honestly and straightforward:
- No accounting entry. The object does not move accounts.
- No movements in accounting/tax registers. It does not calculate VAT, PIT, social tax.
- It does not issue ESF and CNT. ESF goes through IS ESF, CNT — through the module of accompanying invoices; the letter can only carry their PDF copies as attachments.
- What actually happens: files are packed into the outgoing letter and sent through the configured email account (SMTP). The status of the letter changes to "Sent," and the fact of sending is recorded in the history of EDO/letters.
In other words, the object is an "envelope with attachments," not an accounting operation.
7. Printed forms
The object does not have its own printed form — there is no need to print a "list of attachments." Printed forms come into it as attachments from source documents:
- Act of completed works, Invoice (TORG/F-2), Payment invoice;
- Invoice (ESF) — PDF representation from IS ESF;
- Reconciliation act;
- any document through "Print → Save → Attach to letter".
8. Common errors (real messages from 1C) and how to fix
| What you see | Reason | How to fix |
|---|---|---|
| "Email account not filled in" | The SMTP sender's mailbox is not configured. | "Administration → Organizer → Mail → Accounts" — create/check the mailbox, send a test email. |
| "Attachment size exceeds allowed" / letter "stuck" in outgoing | The total volume of files exceeds the server limit. | Compress the PDF, remove unnecessary images, split into two letters, send a link to the file instead of the file itself. |
| "Error sending email: … authentication failed" | Incorrect SMTP password/port or application password is required. | Double-check the login, port (465/587), enable SSL/TLS; for Gmail/mail with 2FA — create an application password. |
| Recipient sees empty attachment (0 KB) | The file data was not saved in the object (the file was moved/deleted before sending). | Reattach the file from the current path and resend. |
| The logo in the signature was sent as a separate file, not in the body | The indicator "show image in body" is not set or the CID is broken. | Open the image attachment, enable display in body; check the HTML signature. |
| "A file with this name already exists" when attaching | Two attachments with the same name. | Rename one of them before adding. |
9. FAQ
Q: Is this a document that needs to be processed? A: No. This is a service object of the built-in mail. It is not processed and does not make accounting movements — it only stores the attachments of the letter.
Q: Why does it have no entries and ESF, since I am sending an invoice? A: The invoice is generated and registered by IS ESF, while revenue and VAT 16% are from the sales document. The letter merely delivers their PDF copies to the client.
Q: How can I see what was actually sent to the client? A: Open the outgoing letter → area "Attached Files." There is an exact list: names, types, sizes. In case of a dispute, this is your proof of sending.
Q: Can I delete old attachments to reduce the database? A: Yes, attachments are the "heaviest" in the database. Through the object list (navigation link), you can find letters with large files. Delete consciously: along with the letter, the confirmation of sending is lost.
Q: The letter is not sending — where to start? A: Check the email account ("Administration → Organizer → Mail"), send a test email. 90% of problems are incorrect SMTP password/port or exceeded attachment size.
Q: What is the maximum size of attachments? A: There is no strict limit in 1C, but mail servers usually cut off letters heavier than 10–20 MB. Send large files as a link or archive in parts.
Q: Why does the logo from the signature come as a separate file? A: The image does not have the indicator "show in body" set or the identifier (CID) is broken. Enable display in body in the attachment properties.
Q: How to attach my file (contract, scan) instead of a printed form to the letter? A: In the letter form — button "Attach file" → select the file from the disk, or "Attached files" of the source document → "Send."
Q: Can I open this object directly?
A: Yes, through "Go to navigation link": e1cib/list/Document.OutgoingElectronicMailAttachedFiles. This is needed for incident analysis and cleaning, not for everyday work.
Q: Does this object calculate PIT, social tax? A: No. It does not calculate any taxes or contributions — this is done by payroll and tax calculation documents.
10. Related documents
- Based on what it appears: owner document — outgoing electronic letter; attachments are initiated by source documents (Sales, Act, Payment invoice, Invoice (ESF), Reconciliation act), from which you click "Send by email."
- What is entered based on it: nothing accounting. At most — an incoming response letter from the client as a separate mail object.
- Works alongside: module EDO, IS ESF (invoices), module CNT (accompanying invoices), directory Attached files.
How to know your release
"Help" → "About the program" — there you will find the platform version 8.3 and configuration release. This instruction is relevant for "Accounting for Kazakhstan," edition 3.0, release 3.0.74.2. In earlier releases, the interface of the built-in mail and send buttons may differ.
The manual is prepared for release 3.0.74.2 "Accounting for Kazakhstan" (ed. 3.0). Check your release before applying.