| [X] | ANNUAL      REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
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|   | For      the fiscal year ended                                                 December      31,      2007                                                               |
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| [  ] | TRANSITION      REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
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|   | For      the transition period from                                                             to                                                                              |
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| CMALT      (CitiMortgage Alternative Loan Trust), Series 2007-A6 |
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| (Exact      name of issuing entity as specified in its  charter) |

| Citicorp      Mortgage Securities, Inc.                   |
|-----------------------------------------------------------|
| (Exact      name of depositor as specified in itscharter) |

| CitiMortgage,      Inc.                                 |
|---------------------------------------------------------|
| (Exact      name of sponsor as specified in itscharter) |

| New      York                                                                              |   | 75-3226674      and 75-3226675                                       |
|--------------------------------------------------------------------------------------------|--------|----------------------------------------------------------------------|
| (State      or Other Jurisdiction of Incorporation or Organization of Issuing      Entity) |   | (I.R.S.      Employer Identification Number of Issuing Entity)  |
| 1000      Technology Drive, O’Fallon, Missouri                                       |   | 63368-2240                                                           |
| (Address      of Principal ExecutiveOffices      of Issuing Entity)                        |   | (Zip      Code)                                                      |

|   | Registrant’s      telephone number, including area code                              (636)      261-1313                                                |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| Large      Accelerated Filer  [   ] | Accelerated      Filer [   ] | Non-Accelerated      Filer [X] |
|--------------------------------------------------------------|---------------------------------------------|--------------------------------|

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| Item      15. | Exhibits,      Financial Statement Schedules  |
|---------------|----------------------------------------------------|
|          | (a)(1)                                        | Not      applicable.  |
|          | (a)(2)                                        | Not      applicable.  |
|          | (a)(3)                                        | Exhibits  |
|          |                                               |  Exhibit      Number | Description |
|          |                                               | 4.1 | Pooling      and Servicing Agreement, dated as of June 1, 2007, incorporated by      reference from Exhibit 4.1 of the Issuing Entity’s Current Report on Form      8-K/A filed with the Commission on August 1, 2007.  |
|          |                                               | 10.1 | Form      of Mortgage Loan Purchase Agreement, dated June 1, 2007, incorporated by      reference from Exhibit 10.1 of the Issuing Entity’s Current Report on Form      8-K/A filed with the Commission on August 1, 2007.  |
|          |                                               | 31.1 | Certification      pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and relevant      rules and regulations of the Commission, dated March 28,2008.  |
|          |                                               | 33.1.1 | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Citilink system, dated February 22, 2008, of CitiMortgage,      Inc.  |
|          |                                               | 33.1.2 | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Fidelity loan servicing system for the period January 1, 2007 through      February 28, 2007, dated 2007, of ABN AMRO Mortgage Group,      Inc.  |
|          |                                               | 33.1.3 | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Fidelity loan servicing system for the period March 1, 2007 through      December 31, 2007, dated February 22, 2008, of CitiMortgage,      Inc.  |
|          |                                               | 33.1.4 | Management      Assertion of Compliance, dated February 29, 2008, of the Agency and Trust      division of Citibank, N.A.  |
|          |                                               | 33.1.5 | Management      Assessment of Compliance with Applicable Servicing Criteria, dated      February 22, 2008, of Citibank, N.A.  |
|          |                                               | 34.1.1 | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.1.  |
|          |                                               | 34.1.2 | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.2.  |
|          |                                               | 34.1.3 | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.3.  |
|          |                                               | 34.1.4 | Report      of Independent Registered Public Accounting Firm, dated February 29, 2008,      of KPMG LLP, relating to Exhibit 33.1.4.  |
|          |                                               | 34.1.5 | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.5.  |
|          |                                               | 35.1.1 | Servicer      Compliance Statement of CitiMortgage, Inc. for the Citilink system, dated      February 22, 2008.  |
|          |                                               | 35.1.2 | Servicer      Compliance Statement of CitiMortgage, Inc. for the Fidelity loan servicing      system, dated February 22, 2008.  |

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| Exhibit      Number | Description                                                                                                                                                                                                                                    |
|---------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.1                 | Pooling      and Servicing Agreement, dated as of June 1, 2007, incorporated by      reference from Exhibit 4.1 of the Issuing Entity’s Current Report on Form      8-K/A filed with the Commission on August 1, 2007.              |
| 10.1                | Form      of Mortgage Loan Purchase Agreement, dated June 1, 2007, incorporated by      reference from Exhibit 10.1 of the Issuing Entity’s Current Report on Form      8-K/A filed with the Commission on August 1, 2007.          |
| 31.1                | Certification      pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and relevant      rules and regulations of the Commission, dated March 28,2008.                                                                              |
| 33.1.1              | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Citilink system, dated February 22, 2008, of CitiMortgage,      Inc.                                                                             |
| 33.1.2              | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Fidelity loan servicing system for the period January 1, 2007 through      February 28, 2007, dated 2007, of ABN AMRO Mortgage Group,      Inc.  |
| 33.1.3              | Management      Assessment of Compliance with Applicable Servicing Criteria for the      Fidelity loan servicing system for the period March 1, 2007 through      December 31, 2007, dated February 22, 2008, of CitiMortgage,      Inc.  |
| 33.1.4              | Management      Assertion of Compliance, dated February 29, 2008, of the Agency and Trust      division of Citibank, N.A.                                                                                                                 |
| 33.1.5              | Management      Assessment of Compliance with Applicable Servicing Criteria, dated      February 22, 2008, of Citibank, N.A.                                                                                                              |
| 34.1.1              | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.1.                                                                                                      |
| 34.1.2              | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.2.                                                                                                      |
| 34.1.3              | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.3.                                                                                                      |
| 34.1.4              | Report      of Independent Registered Public Accounting Firm, dated February 29, 2008,      of KPMG LLP, relating to Exhibit 33.1.4.                                                                                                      |
| 34.1.5              | Report      of Independent Registered Public Accounting Firm, dated February 22, 2008,      of KPMG LLP, relating to Exhibit 33.1.5.                                                                                                      |
| 35.1.1              | Servicer      Compliance Statement of CitiMortgage, Inc. for the Citilink system, dated      February 22, 2008.                                                                                                                           |
| 35.1.2              | Servicer      Compliance Statement of CitiMortgage, Inc. for the Fidelity loan servicing      system, dated February 22, 2008.                                                                                                            |

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